using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;


class Program
{
    static void Main()
    {
        var ver1 = Console.ReadLine().Split(".").Select(int.Parse).ToArray();
        var ver2 = Console.ReadLine().Split(".").Select(int.Parse).ToArray();

        var Program = new Program();
        
        for ( int i = 0; i < ver1.Length; i++)
        {
            if (ver1[i] == ver2[i])
            {
                continue;
            }
            else
            {
                Program.CheckNum(ver1[i], ver2[i]);
                break;
            }
        }
    }
    public void CheckNum(int x, int y)
    {
        if ( x > y)
        {
            Console.WriteLine("YES");
        }
        else if(x < y)
        {
            Console.WriteLine("NO");
        }
    }
}