You are given a password and you need to generate the number of steps required to convert the given password to a strong password. A password is considered strong if (a) it has at least 6 characters and at most 20 characters; (b) it contains at least one lowercase letter and one uppercase letter, and at least one digit; (c) it does not contain three repeating characters in a row. In one step you can: (1) Insert one character to password, (2) delete one character from password, or (3) replace one character of password with another character.

Ex Input:
password = kTzfYtGutbVuQrLCQhhY7W.W5stoqgN5a287n3eKxOJe

Ex Output:
24


Ex Input:
password = xkpiB6xAgch0njaJH.7T.bdz9v8adLJ1a9TWvD

Ex Output:
18


Ex Input:
password = Yp0OA.z71rGIHifELCYism336wbdMMCW

Ex Output:

12