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;     }     if (t == 10) {       for (int i = 1; i < n; i++) cout << 1;       cout << 0 << endl;       return 0;     }     if (n == 1) {       cout << t << endl;       return 0;     }     cout << t;     for (int i = 1; i < n - 1; i++) cout << 0;     cout << t << endl;     return 0;   }   