#include<iostream>
#include<vector>
#include<string>
using namespace std;
int main() {
	int a;
	cin >> a;
	vector<string> b(a);
	for (int i = 0; i < a; i++) {
		cin >> b[i];
	}
	for (int i = 0; i < a-1; i++) {
		cout << b[i];
	}
	cout << b[a - 1] << endl;
	
}