天书奇谈C#版

Here's a nice challange for people who THINK they know how to read other people's code...

It's a small C# program. I know, I know, it doesn't look like it's gonna get compiled, but believe me, it does. Try to guess this program's output, then try to run it. You'll be amazed to see what it does!

 1 class __{static void Main(){O(1,0,"");}static int O(int l,int I,string _){int o;
 2 if(1<l){if(3>l)O(-79,-13,_.Substring(O(-87,1-I,_.Substring(O(-86,0,_.Substring(1
 3 ))))));if(I>l)O(l+1,I,_);o=0==O(-94,-27+l,_)||l!=2?16:I>12?9:O(2,I+1,"air|skyiv"
 4 );}else if(0>l){if(-72>l)o=O(I,l,"@n'+,#'/*{}w+/w#cdnr/+,{}r/*de}+,/*{*+,/w{%+"+
 5 ",/w#q#n+,/#{l+,/n{n+,/+#n+,/#;#q#n+,/+k#;*+,/'r :'d*'3,}{w+K w'K:'+}e#';dq#'l"+
 6 " q#'+d'K#!/+k#;q#'r}eKK#}w'r}eKK{nl]'/#;#q#n'){)#}w'){){nl]'/+#n';d}rw' i;# )"+
 7 "{nl]!/n{n#'; r{#w'r nc{nl]'/#{l,+'K {rw' iK{;[{nl]'/w#q#n'wk nw' iwk{KK{nl]!/"+
 8 "w{%'l##w#' i; :{nl]'/*{q#'ld;r'}{nlwb!/*de}'c ;;{nl'-{}rw]'/+,}##'*}#nc,',#nw"+
 9 "]'/+kd'+e}+;#'rdq#w! nr'/ ') }+}{rl#'{n' ')# }'+}##(!!/");else if(-51<l)o=O((_[
10 0]==47?1:0)+l,I,_.Substring(1));else if(I!=_[0])o=O(-65,I,_.Substring(1));else{o
11 =_[31];System.Console.Write(_[31]);}}else o=0<l?O(2,2,"c#"):47==_[0]?1:O(0,O(-61
12 ,_[0],"!ek;dc i@bK'(q)-[w]*%n+r3#l,{}:\nuwloca-O;m .vpbks,fxntdCeghiry"),_.
13 Substring(1));return o;}}