using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace kasekiVersion
{
    class Program
    {
        static void Main(string[] args)
        {
            var str00 = Console.ReadLine();
            var str11 = Console.ReadLine();

            var str0 = str00.Split('.');
            var str1 = str11.Split('.');
            var yes = false;
            if (str00 == str11)
            {
                Console.WriteLine("YES");
            }
            else
            {
                for (int i = 0; i < 3; i++)
                {
                    var temp0 = int.Parse(str0[i]);
                    var temp1 = int.Parse(str1[i]);
                    if (temp1 < temp0)
                    {
                        yes = true;
                        break;
                    }
                    if (temp0 < temp1)
                    {
                        yes = false;
                        break;
                    }
                }
                Console.WriteLine(yes ? "YES" : "NO");
            }
        }
    }
}