#! /usr/bin/env raku

use lib "lib";
use LinkedList;

unit sub MAIN ($values = "1 2 3 4", :z(:$zero));

my @values = $values.words;

$zero
  ?? ( die "Must be 0..9 only" unless all(@values) ~~ /^<[0..9]>$/ )
  !! ( die "Must be 1..9 only" unless all(@values) ~~ /^<[1..9]>$/ );

my $ll = LinkedList.add-elems(@values>>.Int);

say $ll.nice;