using System;

public class Program {
	public static void Main(string[] args) {
		Char[] a = Console.ReadLine().ToCharArray();
		Char[] b = Console.ReadLine().ToCharArray();
		Array.Sort(a);
		Array.Sort(b);
		string s = "YES";
		for (int i = 0; i < a.Length; i++) {
			if (!a[i].Equals(b[i])) {
				s = "NO";
				break;
			}
		}
		Console.WriteLine(s);
	}
}