#include <iostream>
#include <numeric>
using namespace std;
int size(long long x)
{
	int s = 0;
	while (x > 0)
	{
		x = x / 10;
		s++;
	}
	return s;
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	for (int i = 1; i <= 3; i++)
	{
		long long a, b, n;
		cin >> a >> b >> n;
		long long lkkt = (a * b) / gcd(a, b);
		if (size(lkkt) > n)
			cout << -1;
		else
		{
			cout << lkkt;
			for (int j = 0; j < (n - size(lkkt)); j++)
				cout << 0;
		}
		cout << endl;
	}
}