using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    public void Solve()
    {
        int N = int.Parse(Console.ReadLine());
        List<string> S = new List<string>();
        for (int i = 0; i < N; i++)
        {
            S.Add(Console.ReadLine());   
        }
        Console.WriteLine(string.Join("", S));
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}