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Question: How to split string by types?

Question:How to split string by types?

upslol 5 Maple
type string select substring
December 16 2015
1

I want to separate strings into substrings for example
input is "6,3,A,n,k,L,+,-" then the procedure breaks this string into substrings like 
if a member numeric b:="6,3",or if lowercase c:="n", if uppercase l:="A,L" else m:="+,-"
thanks
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