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 str0 = Console.ReadLine().Split('.');
            var str1 = Console.ReadLine().Split('.');
            var yes = false;
            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;
                }
            }
            Console.WriteLine(yes ? "YES" : "NO");
        }
    }
}