using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        string output;
        string a = Console.ReadLine();
        string b = Console.ReadLine();

        string[] arr1 = new string[a.Length];
        string[] arr2 = new string[a.Length];

        for (int i = 0; i < a.Length; i++)
        {
            arr1[i] = a[i].ToString();
            arr2[i] = b[i].ToString();
        }

        Array.Sort(arr1);
        Array.Sort(arr2);

        if (arr1.SequenceEqual(arr2))
        {
            output = "YES";
        }
        else
        {
            output = "NO";
        }

        Console.WriteLine(output);
    }
}