字符串操作

stuNum = '201709090040'
print('年级是：'+stuNum[0:4])
print('专业编号是：'+stuNum[4:9])
print('序号是：'+stuNum[-3:])

IDNo= '441424199809226968'
print('省市是：'+IDNo[0:2])
print('生日是：'+IDNo[-8:-4])
print('性别是：'+IDNo[-2])

print(ord('+'))
print(chr(9800))
print(chr(9801))
for i in range(12):
    print(9800+i,chr(9800+i))

s = input('明文：')
for c in s:
    print(chr(ord(c)+3),end='')