func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, f = 0, s = 0;     char pass[3], x[2];     cin >> pass[0] >> pass[1];     cin >> n;     for (int i = 0; i < n; i++) {       cin >> x[0] >> x[1];       if (x[0] == pass[0] && x[1] == pass[1]) {         cout <<  YES ;         return 0;       }       if (x[1] == pass[0]) {         f = 1;       }       if (x[0] == pass[1]) {         s = 1;       }     }     if (s && f) {       cout <<  YES ;       return 0;     }     cout <<  NO ;     return 0;   }   