#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define INF 120000000

using namespace std;

typedef pair<int, int> P;
typedef long long int LL;

int main() {
    int n;
    cin >> n;
    string s = "";
    for (int i = 0; i < n; i++) {
        string t;
        cin >> t;
        s += t;
    }

    cout << s << endl;

    return 0;
}