View Compilation Error

0_0_33672466_15790.cpp: In function 'int main()':
0_0_33672466_15790.cpp:10:3: error: expected ';' before 'int'
   int len = strlen(a);
   ^
0_0_33672466_15790.cpp:12:17: error: 'len' was not declared in this scope
   for(int i=0;i<len;i++)
                 ^