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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.
IMO, the problem is in the question. The question does not define "length" precisely.
We have several kind of lengths in a Unicode string such as Code Unit count, Scalar Value count, Grapheme Cluster count, byte count.
This answer is perfectly fine if the question was intended for byte count or Code Unit count.
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