Quiz

A password qualifies as strong when all of the following hold:

- Length falls between 6 and 20 characters inclusive.

- It includes at least one lowercase letter, one uppercase letter, and one digit.

- It has no run of three or more consecutive identical characters ("Baaba0" is strong; "Baaabb0" is not).

Given password, return the fewest insertions, deletions, or single-character replacements needed to make it strong. Return 0 if it is already strong.