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

namespace ConsoleApp28
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] row = Console.ReadLine().Split('.');
            int[] fossil = new int[3];
            for (int i = 0; i < 3; i++)
            {
                fossil[i] = int.Parse(row[i]);
            }

            row = Console.ReadLine().Split('.');
            int[] judge = new int[3];
            for (int i = 0; i < 3; i++)
            {
                judge[i] = int.Parse(row[i]);
            }

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

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