#include <iostream>
#include <math.h>
#define int long long

using namespace std;

int lnko(int a, int b){
    if (b == 0) return a;
    return lnko(b, a % b);
}

int lkkt(int a, int b){
    return a / lnko(a, b) * b;
}

signed main(){
    int A, B, N;
    int c = 3;
    while(c--){
        cin >> A >> B >> N;
        int n = lkkt(A, B);
        int ln = log10f(n) + 1;
        int lN = N;
        //cout << "\tn=" << n << " (" << ln << ")\n";
        if(lN < ln){
            cout << -1 << endl;
            continue;
        }
        else cout << n;
        int cc = lN - ln;
        while(cc-->0) cout << "0";
        cout << endl;
        
    }
    return 0;
}