TASK DEFINITION: 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.
PROBLEM: password = 8KHHHAkL1Lqc7MjXBn1m

SOLUTION: 1

PROBLEM: password = HU3beQMGB6PmDLejmtivS7C19A4ujBU0SRJtzH

SOLUTION: 18

PROBLEM: password = 65R6UsI0L3bEa84JuTcldSv.!b4uXk!Kz57tYK

SOLUTION:
18