using System.Linq;
using System;

public class P
{
    public string a { get; set; }
    public string b { get; set; }
}

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        var ps = new P[n];
        for (int i = 0; i < n; i++)
        {
            string[] line = Console.ReadLine().Trim().Split(' ');
            ps[i] = new P { a = line[0], b = line[1] };
        }
        foreach (var x in ps.OrderBy(x => x.a).ThenBy(x => x.b))
            Console.WriteLine("{0} {1}", x.a, x.b);
    }
}