func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s;     cin >> s;     long long int len = s.length();     long long int cnt = 0;     for (long long int i = 0; i < len; i++) {       if (s[i] ==  Q ) {         cnt++;       }     }     long long int suffixes = cnt;     long long int prefixes = 0;     long long int ans = 0;     for (long long int j = 0; j < len; j++) {       if (s[j] ==  Q ) {         prefixes++;         suffixes--;       }       if (s[j] ==  A ) {         ans += prefixes * suffixes;       }     }     cout << ans << endl;     return 0;   }   