#!/usr/bin/evn perl

use strict;
use warnings;

my ($sa, $pa, $xa) = split / /, <>;
my ($sb, $pb, $xb) = split / /, <>;

if($pa > $pb) {
	print "$sa\n";
} elsif($pa < $pb) {
	print "$sb\n";
} elsif($pa == $pb) {
	print "-1\n";
}

exit;