Welcome to the Monastery. Generally you will find that you get the most help when you show that you have done some work and demonstrate that you are not just looking for someone else to do your homework for you.
I suspect that if you hand in the code I gave above as a homework answer your teacher will either not believe that you wrote it, or will think that you are a smart arse and shouldn't be in the course.
However if you read the documentation for split and join you may find that you can come up with a more acceptable solution for yourself.
DWIM is Perl's answer to Gödel
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