67 characters with same issue that Raul mentions that argument would need to be 
quoted.

(,.@]^:('.'e.[)(a.{~a{~(>:i.25)+(a=.,65 97+/26|i.51)i.a.i.{.)) ::(0$])    'f'

spaced below for legibility

(,.@]^:('.'e.[)              (a.{~a{~(>:i.25)+(a=.,65 97+/26|i.51)i.a.i.{.))    
 ::      (0$])
 decision output          generate  list                                        
                       input error

cheers, bob

On 2012-08-24, at 12:16 PM, Raul Miller wrote:

> I'm not sure how to express that here.
> 
> Consider, for example:
>   ,.^:('.'e.t)s{ ::($:&}.)~n+1+{.t i.~s=:a.{~,65 97+/26|i.51[n=:i.25[t=.
> 
> Here, I need would need quotes around the argument.  And, it's still
> 70 characters.
> 
> -- 
> Raul
> 
> On Fri, Aug 24, 2012 at 3:01 PM, Roger Hui <rogerhui.can...@gmail.com> wrote:
>> I think it is customary to assume that the input is just an argument.  The
>> q solution so assumes.
>> 
>> 
>> 
>> On Fri, Aug 24, 2012 at 11:38 AM, Raul Miller <rauldmil...@gmail.com> wrote:
>> 
>>> On Fri, Aug 24, 2012 at 2:00 PM, Roger Hui <rogerhui.can...@gmail.com>
>>> wrote:
>>>> http://codegolf.stackexchange.com/questions/7036/print-custom-alphabet
>>>> 
>>>> The gauntlet is thrown!
>>> 
>>> The best I can see, right now, is:
>>>   ,.^:('.'e.t)s{ ::($:&}.)~n+1+s i.{.t=.1!:1##s=:a.{~,65
>>> 97+/26|i.51[n=:i.25
>>> 
>>> And this is 74 characters long -- 42% longer than another entry.
>>> 
>>> Note that I am using something like 9 characters for the action of
>>> reading input, and another 10 to give an empty result in an adverse
>>> case.
>>> 
>>> --
>>> Raul
>>> ----------------------------------------------------------------------
>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>> 
>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
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