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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.
The description isn't clear.
Clearly you didn't read the description well enough. Read the error messages, print the inputs, check with expected outputs, and if you're asking for help, you'll need to provide more information than "it does not accept it". (which input fails)
My code produces correct answer using Python in my IDE. I converted it to a string, then converted it to list of integers then use sum function. Yet, when I try sample tests run in the webapp, it does not accept it.