using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

namespace A {
	class main {
		public main() { }
		public static int Main() {
			new main().run();
			return 0;
		}
		void run() {
			Scanner cin = new Scanner();
			String s = cin.next ();
			String t = cin.next ();
			char[] c1=s.ToCharArray();
			char[] c2=t.ToCharArray();
			Array.Sort(c1);
			Array.Sort(c2);
			s=new String(c1);
			t=new String(c2);
			if (s == t) Console.WriteLine ("YES");
			else Console.WriteLine ("NO");
		}
	}

	class Scanner {
		string[] s;
		int i;

		char[] cs = new char[] { ' ' };

		public Scanner() {
			s = new string[0];
			i = 0;
		}
		public string next() {
			if (i < s.Length) return s[i++];
			s = Console.ReadLine().Split(cs, StringSplitOptions.RemoveEmptyEntries);
			i = 0;
			return s[i++];
		}
		public int nextInt() {
			return int.Parse(next());
		}
		public long nextLong() {
			return long.Parse(next());
		}
		public double nextDouble() {
			return double.Parse(next());
		}
	}
}