Hitcon CTF 2014 polyglot (C, Python 2, Python 3, Ruby, Haskell)

hitcon-polyglot

a={-1//1,""""/=>3}
#if 0
BEGIN { puts `cat flag`; exit; }
__END__
"""} # "
import os; os.system('cat flag')
""" # "
#endif
};
main () { system("cat flag"); } /* -} 0
main = do c <- readFile "flag"; putStr c {-
""" # */ // -}