#include <bits/stdc++.h>
using namespace std;

int main()
{
int i;
int N;
char S[ 100 ];
char lpAns[ 500 ];

	cin >> N;

	lpAns[ 0 ] = '\0';
	for( i = 0; i < N; i++ )
	{
		cin >> S;
		strcat( lpAns, S );
	}

	cout << lpAns << endl;

	return 0;
}