#/usr/bin/perl
use Encode;
use utf8;
use List::Util qw/max min/;

binmode STDIN, ':encoding(utf8)';

$i = 1;
$count = 0;
$maxcount = 0;

while(<STDIN>) {
	my $inputtext = $_;
	my @text = split(/ｗ/, $inputtext);

	foreach my $tepart(@text) {
		$count[$i] = length($tepart);
		if ($count[$i] >= $maxcount) {
			$maxcount = $count[$i];
		}
		$i++;
	}

	foreach my $tepart2(@text) {
		$telength = length($tepart2);
		if ($telength == $maxcount) {
			print "$tepart2\n";
		}
	}
}