using System;

public class Program {
	public static void Main(string[] args) {
		string[] a = Console.ReadLine().Split('.');
		string[] b = Console.ReadLine().Split('.');
		if (int.Parse(b[0]+b[1]+b[2]) <= int.Parse(a[0]+a[1]+a[2])) {
			Console.WriteLine("YES");
		} else {
			Console.WriteLine("NO");
		}
	}
}