#!/usr/bin/perl

open DATA,$ARGV[0]if$ARGV[0];$;=$0=~y~a-z~~;map{m'(\d+)(?{$*=chr$,+65;push@{$*},
$^N;$.{$*}++;$,=$,<$;?++$,:0})'}grep!/^10$/,map ord,split//,join'',<DATA>; print
join '' , map chr , @ $_ for 'A' .. ( sort keys ( % . ) ) [ -1 ] ;  print "\n" ;

__DATA__
In cryptography, a scytale (also known as skytale) is a tool used to perform a
transposition cipher, consisting of a cylinder w/ a strip of paper wound around
it on which is written a message across the windings, with the ciphertext
consisting of the unwound paper.  This is one way to implement such a cipher.


##</code><code>##

$,=42;for(34,0,-3,9,-11,11,-17,7,-5){$*.=pack'c'=>$,+=$_}for(reverse split//=>$*
){$%++?$ %%2?push@C,$_,$":push@c,$_,$":(push@C,$_,$")&&push@c,$"}$C[$#C]=$/;($#C
>$#c)?($ c=\@C)&&($ C=\@c):($ c=\@c)&&($C=\@C);$%=$|;for(@$c){print$_^$$C[$%++]}