Web Reference: Write a function that will return the count of distinct case-insensitive alphabetic characters and numeric digits that occur more than once in the input string. The input string can be assumed to contain only alphabets (both uppercase and lowercase) and numeric digits. Write a function that will return the count of distinct case-insensitive alphabetic characters and numeric digits that occur more than once in the input string. In this video, we solve the #12 MOST POPULAR code challenge (kata) on Codewars using Python. The kata "Counting Duplicates" is a 6 kyu difficulty coding challenge.
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