Part 1. 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.
Part 2. Example
password = a
Answer: 5
Explanation: Using 5 steps, it can become a strong password
Part 3. Exercise
password = F2fV0E6oxEX3uIw6FyR9Q
Answer:
1