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

namespace SortItems
{
    class Program
    {
        static void Main(string[] args)
        {
            var a = Console.ReadLine().Split('.').Select(int.Parse).ToList();
            var b = Console.ReadLine().Split('.').Select(int.Parse).ToList();

            for (var i = 0; i < 3; i++)
            {
                if (a[i] > b[i])
                {
                    Console.WriteLine("YES");
                    return;
                }
                else if (a[i] < b[i])
                {
                    Console.WriteLine("NO");
                    return;
                }
            }

            Console.WriteLine("YES");
        }
    }
}