#include<bits/stdc++.h>
#define endl '\n'
#define MAXN 2000
using namespace std;

int main()
{
    int n;
    string ans = "";

    cin >> n;
    while(n--)
    {
        string s;
        cin >> s;
        ans += s;
    }

    cout << ans << endl;
    return 0;
}