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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.
input 7 has only one digit. so, 7**(1) is the way to look at it.
for example 456 is the input then execution looks like 43 +53 +6**3 because it has 3 digits