#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<functional>
#include<fstream>
#define For(N) for (int i = 0; i < N; i++)

using namespace std;
using ll = long long int;
using vi = vector<int>;

int main() {
	int N;
	string s;
	cin >> N;
	while (cin >> s)cout << s;
	cout << endl;
}