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

#define REP(n) for (int i = 0; i < (int)n; ++i)
#define FOR(n, m) for (int i = (int)n; i < (int)m; ++i)
#define SORT(v) sort(v.begin(), v.end())
#define REVERSE(v) reverse(v.begin(), v.end())
typedef complex<double> P;

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n;
	cin >> n;
	string res = "";
	REP(n) {
		string s;
		cin >> s;
		res = res + s;
	}

	cout << res << endl;

	return 0;
}