A password is deemed strong if it satisfies all of the following criteria:

• Its length is at least $6$ and at most $20$ characters.

• It contains at least one lowercase letter, at least one uppercase letter, and at least one digit.

• It does not contain three or more identical characters consecutively (e.g., "Baaabb0" is weak, but "Baaba0" is strong).

Given a string password, determine the minimum number of steps needed to make password strong. If it is already strong, return $0$.

In a single step, you may perform exactly one of the following operations:

• Insert one character into password.

• Delete one character from password. ...