range in ascii

[mieville@mac.com]

Hi all, thanks for the message regarding packages, indeed this was the
problem.
Now I have another questions, I am reading from ada a .txt file and
counting the letters/word. But counting the letters I have declared my
subtype letters is Character range 'a' .. 'z', but I also want to count
upper case letters and other ASCII char.  How should I declare my range
of char.
Thanks for this help and apologies if my questions seems simple, easy
or obvious but I am starting w/ada.
Best, Sib