using System;

class Program
{
    static void Main()
    {
        char[] a = Console.ReadLine().ToCharArray();
        char[] b = Console.ReadLine().ToCharArray();

        string ans = "YES";

        Array.Sort(a);
        Array.Sort(b);

        for (int i = 0; i < a.Length; i++)
        {
            if (a[i] != b[i])
            {
                ans = "NO";
                break;
            }
        }

        Console.WriteLine(ans);
    }
}