Instruction
Write a program that prompts the user to enter a password. If the user enters a invalid password, the program needs to tell the user why it is invalid and ask the user to enter another password. The program should stop only when the user enters a valid password.
Here is one sample run to check these 4 passwords in order
(My password18 pass18 password Mypassword18):
Enter a new password: My password18
Invalid: Only letters and digits
Enter a new password: pass18
Invalid: Too Few Characters (8 at least)
Enter a new password: password
Invalid: At least two digits
Enter a new password: Mypassword18
Valid password!