#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"
#define rep(i, a, n) for (int i = a; i < n; ++i)

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

    rep(i, 0, n) {
        string s;
        cin >> s;
        cout << s;
    }
    cout << endl;
    return 0;
}