func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   map<string, int> m;   string s;   string pr[109];   int darab[109][26];   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     cin >> n;     cout <<  ?   << 1 <<     << n << endl;     for (int i = 1; i <= (n * (n + 1)) / 2; i++) {       cin >> s;       sort(s.begin(), s.end());       m[s]++;     }     if (n == 1) {       cout <<  !   << s << endl;       return 0;     }     cout <<  ?   << 2 <<     << n << endl;     for (int i = 1; i <= (n * (n - 1)) / 2; i++) {       cin >> s;       sort(s.begin(), s.end());       m[s]--;     }     auto it = m.begin();     while (it != m.end()) {       if (it->second > 0) {         pr[(it->first).size()] = (it->first);       }       it++;     }     for (int i = n; i >= 1; i--) {       for (int j = 0; j < i; j++) {         darab[i][pr[i][j] -  a ]++;       }     }     string ans =   ;     for (int i = 1; i <= n; i++) {       int kul = 0;       for (int j = 0; j < 26; j++) {         if (darab[i][j] != darab[i - 1][j]) {           kul = j;           break;         }       }       ans += ((char)( a  + kul));     }     cout <<  !   << ans << endl;     return 0;   }   