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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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In Java I get a failed test for random
input string : 42ipio1262znstzbhi852389369152sbxc5
my ans : 4212628523893691525
expected ans "4212628523893691525"
How is that wrong?