#!/usr/bin/perl

use strict;
use warnings;

my $abc = <>;
my $def = <>;
chomp $abc;
chomp $def;

my @ver = split /\./, $abc;
my @ver2 = split /\./, $def;


for(my $i = 0; $i < 3; $i++) {
	if($ver[$i] > $ver2[$i]) {
		print "YES\n";
		exit;
	} elsif($ver[$i] < $ver2[$i])  {
		print "NO\n";
		exit;
	}
}

print "YES\n";
exit;