View Compilation Error

0_0_30351612_558.cpp: In function 'int main()':
0_0_30351612_558.cpp:52:19: error: 'Ans' was not declared in this scope
   if ((lena + 1 - Ans) & 1) ++Ans;
                   ^
0_0_30351612_558.cpp:54:18: error: 'Ans' was not declared in this scope
   printf("%d\n", Ans);
                  ^
0_0_30351612_558.cpp: At global scope:
0_0_30351612_558.cpp:56:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_30351612_558.cpp:57:1: error: expected declaration before '}' token
 }
 ^