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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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Hello!
By details of this kata we must sum up the CUBES of digits.
I think you need to fix it here "sum += Character.getNumericValue(num);"
However, it is great solution