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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.
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Why would the input start with a zero?
I dont know if you follow strict mode or not, but if you follow when you try to enter an integer 0112 it will complain that 'Octal literals are not allowed in strict mode.'