// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
using namespace std;

void solve(int a , int b , int n){
    int c = (a/gcd(a , b))*b;
    int d = c , e =0;
    while(d != 0){
        d/=10;
        n--;
    }
    if(0 > n){
        cout << "-1" << endl;
        return;
    }
    cout << c;
    while(n--)cout << "0";
    cout << endl;
}

int main() {
    int64_t a , b , n; cin >> a >> b >> n;solve(a , b , n);
    cin >> a >> b >> n;solve(a , b , n);
    cin >> a >> b >> n;solve(a , b , n);
}