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

public class P
{
    public int id { get; set; }
    public int a { get; set; }
    public int b { get; set; }
    public int c { get; set; }
}

public class Hello
{
    public static void Main()
    {
        var ps = new List<P>();
        for (int i = 0; i < 2; i++)
        {
            string[] line = Console.ReadLine().Trim().Split('.');
            var a = int.Parse(line[0]);
            var b = int.Parse(line[1]);
            var c = int.Parse(line[2]);
            ps.Add(new P { a = a, b = b, c = c ,id = i});
        }
        var id = ps.OrderBy(x => x.a).ThenBy(x => x.b).ThenBy(x => x.c).First().id;
        Console.WriteLine(id == 0? "NO":"YES");
    }
}