#!/usr/bin/perl

use strict; use warnings;
use Getopt::Long;

my $newlines = '';
my $file = '';
GetOptions ("newlines" => \$newlines, # print newlines
            "file=s" => \$file # input file
) or die("Error in command line arguments\n");

my %seen = (); 

my $in_file;

if ($file) {
  open my $in_file, $file or die "Could not open $file: $!";
  while (my $line = <$in_file>) {
    last if not defined $line;
    chomp $line;
    my @l = $line =~ /([0-9]+\/[0-9]+\/[0-9]+)/mg;
    foreach my $item (@l) {
      $seen{$item}++;
    }
  }
  close $in_file;
} else {
  for (;;) {
    my $input = <STDIN>;
    last if not defined $input;
    chomp $input;
    my @l = $input =~ /([0-9]+\/[0-9]+\/[0-9]+)/mg;
    foreach my $item (@l) {
      $seen{$item}++;
    }
  }
}

my @uniq = sort gw_comp keys %seen;
if (@uniq) {
  if ($newlines) {
    foreach my $item (@uniq) {
      print "$item\n";
    }
  } else {
    print "@uniq\n";
  }
}

sub gw_comp{   
  # extract $1/$2/$3 for both GAs
  $a =~ /([0-9]+)\/([0-9]+)\/([0-9]+)/;
  my $a1 = $1;
  my $a2 = $2;
  my $a3 = $3;
  $b =~ /([0-9]+)\/([0-9]+)\/([0-9]+)/;
  my $b1 = $1;
  my $b2 = $2;
  my $b3 = $3;

  if ($a1 < $b1) {
    return -1;
  } elsif ($a1 == $b1) {
    if ($a2 < $b2) { 
      return -1;
    }
    elsif($a2 == $b2) {
      return $a3 <=> $b3;
    }
  }
  return 1;
}