Shell Programming and Scripting

Hello All,
I have a file, but I want to separate the file at a particular record with comma"," in the line
Input file
APPLE6SSAMSUNGS5PRICEPERPIECEDOLLAR600EACH010020340URX581949695US
to
Output file
APPLE6S,SAMSUNGS5,PRICEPERPIECE,DOLLAR600EACH,010020340URX581949695,US

This is for Bash/Ksh shell.

Any help is much appreciated.

And how do you tell PRICEPERPIECE,DOLLAR600EACH from PRICE,PERPIECEDOLLAR600,EACH?

I was thinking of using awk -F to separate the fields once I know where to cut then using cut command.

But if there is a single command that I can use like awk or sed to add the commas at the above given positions that will be great.

Again - how are the single fields to be identified?

Oh! that will be constant, like
APPLE5S, 7 characters constant ( it could be APPLE4S,5S or 6S, but it will NOT be APPLE4 or 5 or 6), same with other separation (like SAMSUNGS2,S3,S4,S5 it will NOT be SAMSUNG4 or 5 or 6 etc..,) similarly 010020340URX581949695 number could change but the no of characters would remain same.
So, what I wanted exactly is a comma separation at below records
7,16,29,50,52

I hope this i making sense.

Thanks in advance.

You may want to adapt the proposal for a very similar problem in this post.

Thankyou RudiC! I will give it a shot.