#include <iostream>
#include <string>
using namespace std;

int main()
{
	int n;
	cin >> n;
	string s[10],ans;
	for (int i = 0; i < n; i++)
	{
		cin >> s[i];
		ans += s[i];
	}
	cout << ans << endl;
	fflush (stdin);
	getchar ();
	fflush (stdin);
	getchar ();
	return 0;
}