use warnings;
use strict;

use constant kMaxGap => 7;

my %gappyData;

/^(\d+)\s+(\d+)/ and $2 != 0 and $gappyData{$1} = $2 while <DATA>;

my $lastx;
my $lasty;

for (sort {$a <=> $b} keys %gappyData) {
    next if ! defined $lastx;
    next if ! defined $lasty;
    
    my $gap = $_ - $lastx - 1;
    
    next if $gap == 1;
    next if $gap > kMaxGap;
    next if $gappyData{$_} != $lasty;
    $gappyData{$_} = $lasty for $lastx .. $_;
} continue {
    $lastx = $_;
    $lasty = $gappyData{$_};
}

for (1 .. $lastx) {
    if (defined $gappyData{$_}) {
        print "$_, $gappyData{$_}\n";
    } else {
        print "$_, -\n";
    }
}

__DATA__
1 2
2 3
3 3
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 3
12 0
13 0
14 4