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