View Compilation Error

0_0_32306150_3657.cpp: In function 'int main()':
0_0_32306150_3657.cpp:20:5: error: expected ',' or ';' before 'if'
     if(it!=s.begin()){
     ^
0_0_32306150_3657.cpp:24:6: error: 'else' without a previous 'if'
     }else{
      ^