#include<bits/stdc++.h>
#define rep(i,a,n) for (int i = a;i < n;i++)
#define per(i,n,a) for (int i = n-1;i >= a;i--)
using namespace std;

int main() {
    int n;
    cin >> n;
    rep(i, 0, n) {
        string s;
        cin >> s;
        cout << s;
    }
    cout << endl;
}