//#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <map>
#include <stack>
#include <queue>
#include <cstdio>
#include <cstdlib>
#include <utility>
using namespace std;
#define INF 100000005
#define MAX 200005

string str[10];
int main(){
	int n;
	cin >> n;
	for(int i = 0;i < n;i++){
		cin >> str[i];
		cout << str[i];
	}
	return 0;
}