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

class Main
{
	public static void main ( String[] args )	{
		Scanner in = new Scanner( System.in );
		String word1, word2;
		word1 = in.nextLine();
		word2 = in.nextLine();
       	if ( sort ( word1 ).equals( sort ( word2 ) ) ) {
       		System.out.print( "YES" );
       	} else System.out.print( "NO" ); 
	}
	static String sort( String word1 ) {
    char[] content = word1.toCharArray();
    Arrays.sort( content );
    return new String( content );
	}
}