
Idiomatically determine all the lowercase and uppercase letters   (of the Latin [English] alphabet)   being used currently by a computer programming language.
The method should find the letters regardless of the hardware architecture that is being used (ASCII, EBCDIC, or other).



Task requirements
Display the set of all:

   lowercase letters 
   uppercase letters

that can be used (allowed) by the computer program,


where   letter   is a member of the Latin (English) alphabet:     a ──► z     and     A ──► Z.



You may want to mention what hardware architecture is being used, and if applicable, the operating system.



See also
 Idiomatically determine all the characters that can be used for symbols.


sequence lc = {}, uc = {}
for ch=1 to 255 do
    if islower(ch) then lc &= ch end if
    if isupper(ch) then uc &= ch end if
end for
lc = utf32_to_utf8(lc)&"\n"
uc = utf32_to_utf8(uc)&"\n"
puts(1,lc)
puts(1,uc)
