func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   string str;   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cin >> n >> str;     int ans = 0;     for (int i = 0; i < n; i += 2) {       int cnt = 0;       if (str[i] ==  a )         cnt++;       else         cnt--;       if (str[i + 1] ==  a )         cnt++;       else         cnt--;       if (cnt != 0) {         if (str[i] ==  a )           str[i] =  b ;         else           str[i] =  a ;         ans++;       }     }     cout << ans <<   n ;     cout << str <<   n ;     return 0;   }   