func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a, b, n, j, temp, num;     stringstream s, t;     cin >> a >> b >> n;     string out;     s << a;     num = a;     for (j = 0; j < 10; j++) {       s << j;       s >> temp;       if (temp % b == 0) {         num = temp;         s.clear();         s << num;         break;       } else {         s.clear();         s << num;       }     }     if (j == 10)       cout << -1;     else {       for (int i = 0; i < n - 1; i++) s <<  0 ;       s >> out;       cout << out;     }     return 0;   }   