func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, n;     cin >> a >> b >> n;     a = a * 10;     int f = 0;     for (int i = 0; i < 10; i++) {       if ((a + i) % b == 0) {         cout << a + i;         string s(n - 1,  0 );         cout << s << endl;         f = 1;         break;       }     }     if (!f) cout << -1 << endl;   }   