using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        // No.138 化石のバージョン

        int[] kasekiVer = Console.ReadLine().Split('.').Select(s => int.Parse(s)).ToArray();
        int[] hanteiVer = Console.ReadLine().Split('.').Select(s => int.Parse(s)).ToArray();
        bool isKaseki = true;

        for (int i = 0; i < kasekiVer.Length; i++)
        {
            if (kasekiVer[i] < hanteiVer[i])
                isKaseki = false;
        }

        Console.WriteLine(isKaseki ? "YES" : "NO");

    }
}