func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, t;   int main() {     cin >> n >> t;     long long z = pow(10, n - 2);     if (n == 1 and t == 10) return cout << -1 << endl, 0;     if (n == 1) return cout << t << endl, 0;     if (t == 2 or t == 4 or t == 5 or t == 8 or t == 10)       cout << 40;     else if (t == 7)       cout << 14;     else       cout << 18;     n -= 2;     while (n) {       cout <<  0 ;       n--;     }     cout << endl;   }   