import java.util.*;
import java.lang.*;
import java.io.*;

class Main
{
	public static void main (String[] args) 
	{
		// 入力値の読み込み
		Scanner sc = new Scanner(System.in);
		String  a = sc.next();
		String  b = sc.next();
		
		char[]ca = a.toCharArray();
		char[]cb = b.toCharArray();
		
		Arrays.sort(ca);
		String sortedca = new String(ca);
		Arrays.sort(cb);
		String sortedcb = new String(cb);
		
		if(sortedca.equals(sortedcb)){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
}