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

class Program
{
    static string InputPattern = "Input4";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("4.8.1");
            WillReturn.Add("4.8.0");
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("0.0.0");
            WillReturn.Add("1.1.1");
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("1.2.3");
            WillReturn.Add("3.2.1");
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        int[] KasekiArr = InputList[0].Split('.').Select(X => int.Parse(X)).ToArray();
        int[] CurrArr = InputList[1].Split('.').Select(X => int.Parse(X)).ToArray();

        bool IsKaseki = true;
        for (int I = 0; I <= KasekiArr.GetUpperBound(0); I++) {
            if (KasekiArr[I] < CurrArr[I]) {
                IsKaseki = false; break;
            }
            if (KasekiArr[I] > CurrArr[I]) {
                IsKaseki = true; break;
            }
        }
        Console.WriteLine(IsKaseki ? "YES" : "NO");
    }
}