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.

Input: Consider Input: password = xkpiB6xAgch0njaJH.7T.bdz9v8adLJ1a9TWvD

Output: 18


Input: Consider Input: password = DC007Kc2GEDN3wwQEInAOiskGTl4WPQvkj0b

Output: 16


Input: Consider Input: password = sScC0MFu


Output: 0