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  4           0 LOAD_CONST               0 (3)
              3 LOAD_CONST               1 (37)
              6 LOAD_CONST               2 (72)
              9 LOAD_CONST               3 (9)
             12 LOAD_CONST               4 (6)
             15 LOAD_CONST               5 (132)
             18 BUILD_LIST               6
             21 STORE_NAME               0 (en)

  5          24 LOAD_CONST               6 (101)
             27 LOAD_CONST               7 (96)
             30 LOAD_CONST               8 (23)
             33 LOAD_CONST               9 (68)
             36 LOAD_CONST              10 (112)
             39 LOAD_CONST              11 (42)
             42 LOAD_CONST              12 (107)
             45 LOAD_CONST              13 (62)
             48 LOAD_CONST               7 (96)
             51 LOAD_CONST              14 (53)
             54 LOAD_CONST              15 (176)
             57 LOAD_CONST              16 (179)
             60 LOAD_CONST              17 (98)
             63 LOAD_CONST              14 (53)
             66 LOAD_CONST              18 (67)
             69 LOAD_CONST              19 (29)
             72 LOAD_CONST              20 (41)
             75 LOAD_CONST              21 (120)
             78 LOAD_CONST              22 (60)
             81 LOAD_CONST              23 (106)
             84 LOAD_CONST              24 (51)
             87 LOAD_CONST               6 (101)
             90 LOAD_CONST              25 (178)
             93 LOAD_CONST              26 (189)
             96 LOAD_CONST               6 (101)
             99 LOAD_CONST              27 (48)
            102 BUILD_LIST              26
            105 STORE_NAME               1 (output)

  7         108 LOAD_CONST              28 ('welcome to GWHT2020')
            111 PRINT_ITEM          
            112 PRINT_NEWLINE       

  9         113 LOAD_NAME                2 (raw_input)
            116 LOAD_CONST              29 ('please input your flag:')
            119 CALL_FUNCTION            1
            122 STORE_NAME               3 (flag)

 10         125 LOAD_NAME                3 (flag)
            128 STORE_NAME               4 (str)

 12         131 LOAD_NAME                5 (len)
            134 LOAD_NAME                4 (str)
            137 CALL_FUNCTION            1
            140 STORE_NAME               6 (a)

 13         143 LOAD_NAME                6 (a)
            146 LOAD_CONST              30 (38)
            149 COMPARE_OP               0 (<)
            152 POP_JUMP_IF_FALSE      173

 14         155 LOAD_CONST              31 ('lenth wrong!')
            158 PRINT_ITEM          
            159 PRINT_NEWLINE       

 15         160 LOAD_NAME                7 (exit)
            163 LOAD_CONST              32 (0)
            166 CALL_FUNCTION            1
            169 POP_TOP             
            170 JUMP_FORWARD             0 (to 173)

 17     >>  173 LOAD_NAME                8 (ord)
            176 LOAD_NAME                4 (str)
            179 LOAD_CONST              32 (0)
            182 BINARY_SUBSCR       
            183 CALL_FUNCTION            1
            186 LOAD_CONST              33 (2020)
            189 BINARY_MULTIPLY     
            190 LOAD_NAME                8 (ord)
            193 LOAD_NAME                4 (str)
            196 LOAD_CONST              34 (1)
            199 BINARY_SUBSCR       
            200 CALL_FUNCTION            1
            203 BINARY_ADD          
            204 LOAD_CONST              33 (2020)
            207 BINARY_MULTIPLY     
            208 LOAD_NAME                8 (ord)
            211 LOAD_NAME                4 (str)
            214 LOAD_CONST              35 (2)
            217 BINARY_SUBSCR       
            218 CALL_FUNCTION            1
            221 BINARY_ADD          
            222 LOAD_CONST              33 (2020)
            225 BINARY_MULTIPLY     
            226 LOAD_NAME                8 (ord)
            229 LOAD_NAME                4 (str)
            232 LOAD_CONST               0 (3)
            235 BINARY_SUBSCR       
            236 CALL_FUNCTION            1
            239 BINARY_ADD          
            240 LOAD_CONST              33 (2020)
            243 BINARY_MULTIPLY     
            244 LOAD_NAME                8 (ord)
            247 LOAD_NAME                4 (str)
            250 LOAD_CONST              36 (4)
            253 BINARY_SUBSCR       
            254 CALL_FUNCTION            1
            257 BINARY_ADD          
            258 LOAD_CONST              37 (1182843538814603)
            261 COMPARE_OP               2 (==)
            264 POP_JUMP_IF_FALSE      275

 18         267 LOAD_CONST              38 ('good!continue\xe2\x80\xa6\xe2\x80\xa6')
            270 PRINT_ITEM          
            271 PRINT_NEWLINE       
            272 JUMP_FORWARD            15 (to 290)

 20     >>  275 LOAD_CONST              39 ('bye~')
            278 PRINT_ITEM          
            279 PRINT_NEWLINE       

 21         280 LOAD_NAME                7 (exit)
            283 LOAD_CONST              32 (0)
            286 CALL_FUNCTION            1
            289 POP_TOP             

 23     >>  290 BUILD_LIST               0
            293 STORE_NAME               9 (x)

 24         296 LOAD_CONST              40 (5)
            299 STORE_NAME              10 (k)

 25         302 SETUP_LOOP             128 (to 433)
            305 LOAD_NAME               11 (range)
            308 LOAD_CONST              41 (13)
            311 CALL_FUNCTION            1
            314 GET_ITER            
        >>  315 FOR_ITER               114 (to 432)
            318 STORE_NAME              12 (i)

 26         321 LOAD_NAME                8 (ord)
            324 LOAD_NAME                4 (str)
            327 LOAD_NAME               10 (k)
            330 BINARY_SUBSCR       
            331 CALL_FUNCTION            1
            334 STORE_NAME              13 (b)

 27         337 LOAD_NAME                8 (ord)
            340 LOAD_NAME                4 (str)
            343 LOAD_NAME               10 (k)
            346 LOAD_CONST              34 (1)
            349 BINARY_ADD          
            350 BINARY_SUBSCR       
            351 CALL_FUNCTION            1
            354 STORE_NAME              14 (c)

 28         357 LOAD_NAME               14 (c)
            360 LOAD_NAME                0 (en)
            363 LOAD_NAME               12 (i)
            366 LOAD_CONST               4 (6)
            369 BINARY_MODULO       
            370 BINARY_SUBSCR       
            371 BINARY_XOR          
            372 STORE_NAME              15 (a11)

 29         375 LOAD_NAME               13 (b)
            378 LOAD_NAME                0 (en)
            381 LOAD_NAME               12 (i)
            384 LOAD_CONST               4 (6)
            387 BINARY_MODULO       
            388 BINARY_SUBSCR       
            389 BINARY_XOR          
            390 STORE_NAME              16 (a22)

 30         393 LOAD_NAME                9 (x)
            396 LOAD_ATTR               17 (append)
            399 LOAD_NAME               15 (a11)
            402 CALL_FUNCTION            1
            405 POP_TOP             

 31         406 LOAD_NAME                9 (x)
            409 LOAD_ATTR               17 (append)
            412 LOAD_NAME               16 (a22)
            415 CALL_FUNCTION            1
            418 POP_TOP             

 32         419 LOAD_NAME               10 (k)
            422 LOAD_CONST              35 (2)
            425 INPLACE_ADD         
            426 STORE_NAME              10 (k)
            429 JUMP_ABSOLUTE          315
        >>  432 POP_BLOCK           

 33     >>  433 LOAD_NAME                9 (x)
            436 LOAD_NAME                1 (output)
            439 COMPARE_OP               2 (==)
            442 POP_JUMP_IF_FALSE      453

 34         445 LOAD_CONST              38 ('good!continue\xe2\x80\xa6\xe2\x80\xa6')
            448 PRINT_ITEM          
            449 PRINT_NEWLINE       
            450 JUMP_FORWARD            15 (to 468)

 36     >>  453 LOAD_CONST              42 ('oh,you are wrong!')
            456 PRINT_ITEM          
            457 PRINT_NEWLINE       

 37         458 LOAD_NAME                7 (exit)
            461 LOAD_CONST              32 (0)
            464 CALL_FUNCTION            1
            467 POP_TOP             

 39     >>  468 LOAD_NAME                5 (len)
            471 LOAD_NAME                4 (str)
            474 CALL_FUNCTION            1
            477 STORE_NAME              18 (l)

 40         480 LOAD_NAME                8 (ord)
            483 LOAD_NAME                4 (str)
            486 LOAD_NAME               18 (l)
            489 LOAD_CONST              43 (7)
            492 BINARY_SUBTRACT     
            493 BINARY_SUBSCR       
            494 CALL_FUNCTION            1
            497 STORE_NAME              19 (a1)

 41         500 LOAD_NAME                8 (ord)
            503 LOAD_NAME                4 (str)
            506 LOAD_NAME               18 (l)
            509 LOAD_CONST               4 (6)
            512 BINARY_SUBTRACT     
            513 BINARY_SUBSCR       
            514 CALL_FUNCTION            1
            517 STORE_NAME              20 (a2)

 42         520 LOAD_NAME                8 (ord)
            523 LOAD_NAME                4 (str)
            526 LOAD_NAME               18 (l)
            529 LOAD_CONST              40 (5)
            532 BINARY_SUBTRACT     
            533 BINARY_SUBSCR       
            534 CALL_FUNCTION            1
            537 STORE_NAME              21 (a3)

 43         540 LOAD_NAME                8 (ord)
            543 LOAD_NAME                4 (str)
            546 LOAD_NAME               18 (l)
            549 LOAD_CONST              36 (4)
            552 BINARY_SUBTRACT     
            553 BINARY_SUBSCR       
            554 CALL_FUNCTION            1
            557 STORE_NAME              22 (a4)

 44         560 LOAD_NAME                8 (ord)
            563 LOAD_NAME                4 (str)
            566 LOAD_NAME               18 (l)
            569 LOAD_CONST               0 (3)
            572 BINARY_SUBTRACT     
            573 BINARY_SUBSCR       
            574 CALL_FUNCTION            1
            577 STORE_NAME              23 (a5)

 45         580 LOAD_NAME                8 (ord)
            583 LOAD_NAME                4 (str)
            586 LOAD_NAME               18 (l)
            589 LOAD_CONST              35 (2)
            592 BINARY_SUBTRACT     
            593 BINARY_SUBSCR       
            594 CALL_FUNCTION            1
            597 STORE_NAME              24 (a6)

 46         600 LOAD_NAME               19 (a1)
            603 LOAD_CONST               0 (3)
            606 BINARY_MULTIPLY     
            607 LOAD_NAME               20 (a2)
            610 LOAD_CONST              35 (2)
            613 BINARY_MULTIPLY     
            614 BINARY_ADD          
            615 LOAD_NAME               21 (a3)
            618 LOAD_CONST              40 (5)
            621 BINARY_MULTIPLY     
            622 BINARY_ADD          
            623 LOAD_CONST              44 (1003)
            626 COMPARE_OP               2 (==)
            629 POP_JUMP_IF_FALSE      807

 47         632 LOAD_NAME               19 (a1)
            635 LOAD_CONST              36 (4)
            638 BINARY_MULTIPLY     
            639 LOAD_NAME               20 (a2)
            642 LOAD_CONST              43 (7)
            645 BINARY_MULTIPLY     
            646 BINARY_ADD          
            647 LOAD_NAME               21 (a3)
            650 LOAD_CONST               3 (9)
            653 BINARY_MULTIPLY     
            654 BINARY_ADD          
            655 LOAD_CONST              45 (2013)
            658 COMPARE_OP               2 (==)
            661 POP_JUMP_IF_FALSE      807

 48         664 LOAD_NAME               19 (a1)
            667 LOAD_NAME               20 (a2)
            670 LOAD_CONST              46 (8)
            673 BINARY_MULTIPLY     
            674 BINARY_ADD          
            675 LOAD_NAME               21 (a3)
            678 LOAD_CONST              35 (2)
            681 BINARY_MULTIPLY     
            682 BINARY_ADD          
            683 LOAD_CONST              47 (1109)
            686 COMPARE_OP               2 (==)
            689 POP_JUMP_IF_FALSE      804

 49         692 LOAD_NAME               22 (a4)
            695 LOAD_CONST               0 (3)
            698 BINARY_MULTIPLY     
            699 LOAD_NAME               23 (a5)
            702 LOAD_CONST              35 (2)
            705 BINARY_MULTIPLY     
            706 BINARY_ADD          
            707 LOAD_NAME               24 (a6)
            710 LOAD_CONST              40 (5)
            713 BINARY_MULTIPLY     
            714 BINARY_ADD          
            715 LOAD_CONST              48 (671)
            718 COMPARE_OP               2 (==)
            721 POP_JUMP_IF_FALSE      801

 50         724 LOAD_NAME               22 (a4)
            727 LOAD_CONST              36 (4)
            730 BINARY_MULTIPLY     
            731 LOAD_NAME               23 (a5)
            734 LOAD_CONST              43 (7)
            737 BINARY_MULTIPLY     
            738 BINARY_ADD          
            739 LOAD_NAME               24 (a6)
            742 LOAD_CONST               3 (9)
            745 BINARY_MULTIPLY     
            746 BINARY_ADD          
            747 LOAD_CONST              49 (1252)
            750 COMPARE_OP               2 (==)
            753 POP_JUMP_IF_FALSE      798

 51         756 LOAD_NAME               22 (a4)
            759 LOAD_NAME               23 (a5)
            762 LOAD_CONST              46 (8)
            765 BINARY_MULTIPLY     
            766 BINARY_ADD          
            767 LOAD_NAME               24 (a6)
            770 LOAD_CONST              35 (2)
            773 BINARY_MULTIPLY     
            774 BINARY_ADD          
            775 LOAD_CONST              50 (644)
            778 COMPARE_OP               2 (==)
            781 POP_JUMP_IF_FALSE      795

 52         784 LOAD_CONST              51 ('congraduation!you get the right flag!')
            787 PRINT_ITEM          
            788 PRINT_NEWLINE       
            789 JUMP_ABSOLUTE          795
            792 JUMP_ABSOLUTE          798
        >>  795 JUMP_ABSOLUTE          801
        >>  798 JUMP_ABSOLUTE          804
        >>  801 JUMP_ABSOLUTE          807
        >>  804 JUMP_FORWARD             0 (to 807)
        >>  807 LOAD_CONST              52 (None)
            810 RETURN_VALUE 

看出了是python字节码，然后就顺手查了一下
参考了下面这个文章：
https://blog.csdn.net/palmer9/article/details/112007899
方程组求解就可以了
over.