#!/usr/bin/perl

use strict;
use warnings;

my $stra = <>;
my $strb = <>;
chomp $stra;
chomp $strb;
my @arraya = split //, $stra;
my @arrayb = split //, $strb;

@arraya = sort @arraya;
@arrayb = sort @arrayb;

for(my $i = 0; $i < length $stra; $i++) {
	if($arraya[$i] ne $arrayb[$i]) {
		print "NO\n";
		exit;
	}
}

print "YES\n";

exit;