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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.
Memory size, not byte size.
'Hello':
Byte size (size of the string in UTF-8 encoding): 5 bytes
Memory size (total memory occupied by the string in Python): 54 bytes
Nice little Kata to go back to basics. It may help to explain that LEN can't be used, or possibly an 8kyu.