#include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>
#include <utility>
#include <queue>
#include <set>
#include <map>

using namespace std;
typedef  long long ll;
typedef pair<int,int> PII;
typedef vector<int> VI;
typedef vector<VI> VVI;
#define  MP make_pair
#define  PB push_back
#define inf  1000000007

int main(){
	int n;
	string ans;
	cin >> n;
	for(int i=0;i<n;i++){
		string tmp;
		cin >> tmp;
		ans += tmp;
	}
	cout << ans << endl;
	return 0;
}