#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;


int main() {
    int N;
    cin >> N;
    string s;
    string res;
    for (int i = 0; i < N; ++i) {
        cin >> s;
        res += s;
    }

    cout << res << endl;


    return 0;
}