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

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] x = Console.ReadLine().Split('.').Select(int.Parse).ToArray();
            int[] y = Console.ReadLine().Split('.').Select(int.Parse).ToArray();
            if (x[0] == y[0])
            {
                if (x[1] == y[1])
                {
                    Console.WriteLine(x[2] >= y[2] ? "YES" : "NO");
                }
                else
                {
                    Console.WriteLine(x[1] > y[1] ? "YES" : "NO");
                }
            }
            else
            {
                Console.WriteLine(x[0] > y[0] ? "YES" : "NO");
            }
        }
    }
}