1. (Check password) Some Web sites impose certain rules for passwords. Write a function that checks whether a string is a valid password. Suppose the password rules are as follows: • A password must have at least eight characters. • A password must consist of only letters and digits. • A password must contain at least two digits. Write a program that prompts the user to enter a password and displays valid password if the rules are followed or invalid password otherwise. Enter a string for password: ab Invalid password Enter a string for password: a 123 b2 Invalid password Enter a string for password: x11qw23b Valid password

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