Just regex for what you want...

#!/usr/bin/perl

# http://perlmonks.org/?node_id=1174610

use strict;
use warnings;

while(<DATA>)
  {
  my @values = /-?\d+/g;
  print "@values\n";
  }

__DATA__
-8-18 -9-10 -8 -7 -9-10 -9 -6 -5 -8 12 -7-10 -8 -8 -8 -8 -6
-3  2  2 -2 -8  1 -2 -5 -1 -4 -6  6 -4 -6 -5 -1  0 -8 -6 -6
 3 -6 -3 -6 -2 -5 -5 -5 -4  4 -3 -2 -2 -3 -5  1  3 -7 -4  3
 1 -6 -5 -6  4 -5 -6 -5 -6  3  1 -5 -3 -2 -5 -1  3 -4 -3  4
 2 -8 -6 -7 -8 -8 -8  7 -8 -9 -9 -7 -8 -6 -8 -4 -7 -9 -9 -8
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