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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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Description clearly says "Take 2 strings s1 and s2 including only letters from a to z"
so no need to check if it only contains letters from a-z
not a good practice to name a dictionary as a list
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why convert to int .. when type(num) == int
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nice :)
yes, this kata only asked to fix the bug in the code. not rewrite the entire code.