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

class Program
{
    static void Main(string[] args)
    {
        int[] a = Console.ReadLine().Split('.').Select(x => int.Parse(x)).ToArray();
        int[] b = Console.ReadLine().Split('.').Select(x => int.Parse(x)).ToArray();

        for (int i = 0; i < 3; i++)
        {
            if (a[i] < b[i])
            {
                Console.WriteLine("YES");
                return;
            }

            if (a[i] > b[i])
            {
                Console.WriteLine("NO");
                return;
            }
        }
    }
}