func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, t;     cin >> n >> t;     if (n == 1 && t == 10) {       cout <<  -1  << endl;       return 0;     }     cout << ((t == 10) ? 1 : t);     while (n-- > 1) {       cout <<  0 ;     }     return 0;   }   