/in/foo.cc:3:11: error: empty character constant
     ans = '';
           ^~
/in/foo.cc:6:33: warning: multi-character character constant [-Wmultichar]
     em = eval(str_o.replace('^','**'))
                                 ^~~~
/in/foo.cc:8:45: warning: multi-character character constant [-Wmultichar]
         if(em==eval(raw_input().replace('^','**'))):
                                             ^~~~
/in/foo.cc:13:17: warning: character constant too long for its type
 if  __name__ == '__main__':
                 ^~~~~~~~~~
/in/foo.cc:1:1: error: 'def' does not name a type
 def main():
 ^~~
/in/foo.cc:4:5: error: 'str_o' does not name a type
     str_o = raw_input()
     ^~~~~