using System;

class Q0069
{
	public static void Main()
	{
		char[] a = Console.ReadLine().ToCharArray();
		char[] b = Console.ReadLine().ToCharArray();

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

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

		Console.WriteLine(output);
	}
}