func_code_string: #include <bits/stdc++.h>   using namespace std;   string solve() {     int a, b, n;     string number =   ;     cin >> a >> b >> n;     bool added;     added = false;     a *= 10;     for (int j = 1; j < 11; j++) {       if (a % b == 0) {         added = true;         break;       }       a++;     }     if (!added) return  -1 ;     number = to_string(a);     for (int i = 0; i < n - 1; i++) number +=  0 ;     return number;   }   int main(void) { cout << solve() <<   n ; }   