#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    int N;
    cin >> N;

    rep(i, N) {
        string s;
        cin >> s;
        cout << s;
    }
    cout << endl;

    return 0;
}