my $last_seq;

while (<>) {
    my ($seq, $p1, $p2) = (split)[0, 2, 3];
    ($p2, $p1) = ($p1, $p2) if $p2 < $p1;

    if (defined($last_seq)) {
        if ($seq eq $last_seq) {
            print(",");
        } else {
            print("\n$seq ");
        }
    }

    print("$p1..$p2");

    $last_seq = $seq;
}

print("\n") if defined($last_seq);