sub TIEHANDLE($;$) 
{
    my $pkg = shift;
    my $ref = shift || [];
    push @{$ref}, 0;

    bless( $ref, $pkg );
}

sub READLINE 
{
    my $ref = shift;
    return @{$ref} > 1 ? ">Seq" . ++$ref->[-1] . "\n" . shift (@{$ref}) . "\n" : undef;
}