func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t, n;     cin >> t;     string s;     for (int i = 0; i < t; i++) {       cin >> n;       cin >> s;       int k = 0;       if (n % 2 == 0) {         for (int i = 1; i < n; i += 2)           if ((int(s[i]) - 48) % 2 == 0) {             k = 1;             cout << 2 <<   n ;             break;           }         if (k == 0) cout << 1 <<   n ;       }       if (n % 2 == 1) {         for (int i = 0; i < n; i += 2)           if ((int(s[i]) - 48) % 2 == 1) {             k = 1;             cout << 1 <<   n ;             break;           }         if (k == 0) cout << 2 <<   n ;       }     }     return 0;   }   