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#! /usr/bin/env perl
use Perl6::Junction 'all';
use List::MoreUtils qw(uniq);
use Getopt::Long;
use feature 'say';
use strict;
my $verbose = 0;
GetOptions("verbose" => \$verbose);
my @A = @ARGV;
die "Please specify at least one element" unless @A;
die "Integers only" unless all(@A) == qr/^\d+$/;
my @positively_sorted = uniq sort { $a <=> $b } grep { $_ > 0 } @A;
say ": Positively Sorted: " . join(", ", @positively_sorted) if $verbose;
my $expected = 1;
for my $current (@positively_sorted)
{
say ": Current value: $current - expected $expected" if $verbose;
last if $current != $expected;
$expected++;
}
say $expected;
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