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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.
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Why would it fail on non-ascii names?
Yes, always read the input range carefully first before doing kata!
According to the description,
$can't be in the input at all...Actualy the expected result should therefore be 0. In my opinion it is quite a relevant test case, since the expected behaviour is explicitly stated in the description.
Did you see it that the description says: