func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     int t;     cin >> n >> t;     if (t == 10 && n == 1) return cout << -1, 0;     string s;     if (t == 10)       s +=  10 , n -= 2;     else       s += (char)(t + 48), n--;     while (n--) s +=  0 ;     cout << s;   }   