func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     string cad;     cin >> cad;     map<char, int> M;     for (int i = 0; i < cad.size(); i++) M[cad[i]]++;     int xx = M[ x ];     int yy = M[ y ];     int ans = max(xx, yy) - min(xx, yy);     if (max(xx, yy) == M[ x ])       cout << string(ans,  x ) << endl;     else       cout << string(ans,  y ) << endl;     return 0;   }   