for my $aref (values %alphabet) {
    say for @$aref;
}

##</code><code>##

...
use Data::Dumper;
print Dumper \%alphabet;

##</code><code>##

$VAR1 = {
          'SCALAR(0x783790)' => [
                                  '1',
                                  '2',
                                  '3',
                                  '4'
                                ],
          'SCALAR(0x783e50)' => [
                                  '9',
                                  '8',
                                  '7',
                                  '6'
                                ]
        };