using System;
using System.Linq;

public class P0069 {
    public static void Main() {
        var a = Console.ReadLine().Trim().ToCharArray().ToList();
        var b = Console.ReadLine().Trim().ToCharArray().ToList();
        a.Sort();
        b.Sort();
        if(String.Join("", a) == String.Join("", b)) {
            Console.WriteLine("YES");
        } else {
            Console.WriteLine("NO");
        }
    }
}