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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.
This solution is very idomatic and easily read. So it deserves it's spot at the top.
Your solution has a hidden assumed limit and a bug on the ammount of any specific symbol appearing in the string.
If s1 contains MAX_INT or more appearances of a single character your solution starts returning the wrong output.