use strict;
use warnings;

my @array = (-11,-13,4, 22, 17);
print find_max_odd(@array), "\n";
sub find_max_odd {
    my $max; 
    while (my $current = shift) {
        next unless $current % 2;
        if (not defined $max or $current > $max) {
            $max = $current;
        }
    }
    return $max // "undefined";
 }