编写程序以检查用户输入的密码是否有效[关闭]

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I am working on an assignment:

A website requires the users to input username and password to register. Write a program to check the validity of password input by users. Following are the criteria for checking the password:

1. At least 1 letter between [az]
2. At least 1 number between [0-9]
3. At least 1 letter between [AZ]
4. At least 1 character from [$#@]
5. Minimum length of transaction password: 6
6. Maximum length of transaction password: 12

Your program should accept a sequence of comma separated passwords and will check them according to the above criteria. Passwords that match the criteria are to be printed, each separated by a comma.

Example
If the following passwords are given as input to the program: ABd1234@1,a F1#,2w3E*,2We3345
Then, the output of the program should be: ABd1234@1

Here is my code so far:

TBD

My question:

TBD