Name:Abhishek Kumar
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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Nice, but this will not work in case text contains uppercase characters.
Just see pydoc itertools.groupby.
I think the better way would be to assign '' to prev. Since '' is itself a sequence, it should not occur as per the question's specifications.