func_code_string: #include <bits/stdc++.h>   using namespace std;   bool equal(string s) {     int n = 0;     for (int i = 0; i < s.length(); i++) {       if (s[i] ==  a ) n++;     }     if (n * 2 != s.length()) return false;     return true;   }   string s, s1, sex;   int n, d, k;   int main() {     cin >> k;     cin >> s;     n = s.length();     sex = s;     for (int i = 2; i <= n; i = i + 2) {       for (int j = 0; j <= n - i; j++) {         s1 = s.substr(j, i);         if (equal(s1)) {           while (s.find(s1) != -1) {             s.erase(s.find(s1), 1);             d++;           }         }       }     }     cout <<  25 ;   }   