Help with key class

Hi,
I am working on a particular project in which i want feedback only from the alphabets a-z on the keyboard. all other keys including enter escape and function keys should be disabled. Is there any way i can get this done in as 2.0?
or is there a way to see when only these keys are pressed then a set of function is called and so on?

if the above is confusing then to make it simple:

  1. if i press key ‘a-z’ on keyboard then a mc plays saying good… or whatever.
  2. any other key if pressed then message says that the key is disabled.

Key.isDown method becomes tooo tedious for so many keys. any loop method?

thanks.
zooked