func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k;     cin >> n >> k;     if (n == 1 and k == 10) {       cout <<  -1 ;     } else if (k == 10) {       cout <<  1 ;       for (int i = 1; i < n; i++) {         cout <<  0 ;       }     } else {       for (int i = 0; i < n; i++) {         cout << k;       }     }     cout <<   n ;     return 0;   }   