func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1000050;   int a[N];   int main() {     int n, k;     cin >> n >> k;     if (n == 1 && k == 10)       cout <<  -1  << endl;     else {       if (k == 10) {         cout <<  1 ;         for (int i = 1; i < n; i++) cout <<  0 ;         cout << endl;       } else {         for (int i = 0; i < n; i++) cout << k;         cout << endl;       }     }     return 0;   }   