while(<IN>)
{
    my $t = substr($_, 259, 1);
    if($t eq "B")
    {
        print B $_;
    }
    else if ($t eq "T")
    {
        print T $_;
    }
    else if ()
    {
        # and so on for at least 10 lines!...
    }
}

##</code><code>##

-- 
Joost       downtime n. The period during which a system
            is error-free and immune from user input.