func_code_string: #include <bits/stdc++.h>   using namespace std;   map<long long int, long long int> mp, mk;   set<long long int> s1, s2;   vector<long long int> v, w;   string s =   , p =   , q =   ;   char ch;   long long int m, n, c, i, j, k, l, r, x, t, y, u, e, f, g, h, mn, mx, d, z;   int main() {     cin >> n >> t;     if (t == 10) {       if (n == 1) {         cout << -1;         return 0;       } else {         cout << 1;         for (i = 1; i < n; i++) cout << 0;         return 0;       }     }     for (i = 1; i <= n; i++) cout << t;   }   