using System;

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