#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
using namespace std;
#define Would
#define you


int main() {
	int n;
	string h;
	cin >> n;
	for (int i = 0; i < n; ++i) {
		cin >> h;
		cout << h;
	}
	cout << endl;
}