using System;

class Program
{
    static void Main()
    {
        char[] s0 = Console.ReadLine().ToCharArray();
        char[] s1 = Console.ReadLine().ToCharArray();
        Array.Sort(s0);
        Array.Sort(s1);
        if(s0.ToString() == s1.ToString())
        {
            Console.WriteLine($"YES");
        }
        else
        {
            Console.WriteLine($"NO");
        }
    }
}