$valid_line==0;
$nbr_line=$ARGV[1];

# format the first digit @_[0], length @_[1] wide with leading 0s
sub format {
        return substr("00000000", 0, (@_[1] - length(@_[0]))) . @_[0];
}

open(F0, $ARGV[0]);
while(<F0>) {
    if (/[a-zA-Z0-9]/) {
        $valid_line++;
        $max_tab = 0;
        while (/\t+/g) {
#            print  $-[0], ' ', $+[0], ' ';
            $max[$max_tab] = $+[0] if $max[$max_tab] < $+[0] ;$max_tab++;
        }
#        print "\n";
        $nbr_tab = $max_tab if $nbr_tab < $max_tab;
    }
}

$max_line=$nbr_line+$valid_line;
seek F0,0,0;

while(<F0>) {
     s/\r//;chop;
     $max_tab = 0;

    while (/[^\t]+/g) {
         print substr("\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t", 0, ($max[$max_tab++] - $+[0]) / 8), substr($_,  $-[0], $+[0]);
    }
    print "\n"; 

}
close F0;