#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using llu = long long unsigned;

vector<ll> dx = { 0, 0, -1, 1};
vector<ll> dy = {-1, 1,  0, 0};

#define MOD 1000000007
int main() {
    string S, T;
    int N;
    cin >> S >> T >> N;
    string ret = S;
    for (int i=0; i<N; i++) {
        ret += ("_"+T);
    }
    cout << ret << endl;
    return 0;
}