chomp(my $black = <STDIN>);
my $white = ($black eq 'oda') ? 'yukiko' : 'oda';
my ($b_num, $w_num) = (0, 0);
while (chomp($_ = <STDIN>)) {
    my @array = split('', $_);
    $b_num += scalar(grep {$_ eq 'b'} @array);
    $w_num += scalar(grep {$_ eq 'w'} @array);
}
print(($b_num > $w_num) ? $white : $black);
print "\n";