#include "bits/stdc++.h"

using namespace std;
void solve(){
    int n;
    cin >> n;
    string s = "";
    for(int i = 0;i < n;i++){
        string tmp;
        cin >> tmp;
        s = s + tmp;
    }
    cout << s << endl;
}

int main() {
    solve();
    return 0;
}