func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s1;     int count = 0;     cin >> s1;     char c = s1[0];     for (int i = 0; i < s1.length(); i++) {       if (s1[i] == c)         count++;       else if (s1[i] > c) {         count = 1;         c = s1[i];       }     }     cout << string(count, c);     return 0;   }   