/* package whatever; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
    	String A = sc.next();
    	char[] a = A.toCharArray();
    	String B = sc.next();
    	char[] b = B.toCharArray();
    	
    	Arrays.sort(a);
    	Arrays.sort(b);
    	
    	A = String.copyValueOf(a);
    	B = String.copyValueOf(b);
    	
    	System.out.println((A.equals(B)) ? "YES":"NO");
    	
	}
}