func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int a, b, c = 0, e, i, n;       cin >> n;       vector<char> v;       char s[n + 1];       cin >> s;       for (i = 0; i < n; i++) {         if ((s[i] -  0 ) % 2 != 0) {           c++;           v.push_back(s[i]);           if (c == 2) break;         }       }       if (c < 2)         cout <<  -1 n ;       else {         for (i = 0; i < 2; i++) cout << v[i];         cout <<   n ;       }     }   }   