use strict;
use warnings;

my $str_a = <STDIN>;
my $str_b = <STDIN>;
chomp $str_a; chomp $str_b;

my(%ch_a, %ch_b);
map {$ch_a{$_}++} split('', $str_a);
map {$ch_b{$_}++} split('', $str_b);

my $ans = 'YES';
for(keys %ch_a){
    if(!defined($ch_b{$_}) or $ch_a{$_} != $ch_b{$_}){
        $ans = 'NO';
        last;
    }
}
print $ans;