C$++$ A website requires that passwords only contain numbers. For each character in password that is not a number, replace the character with $\text{'}9\text{'}.$

Ex: If the input is $35$N$862,$ then the output is:

Adjusted password: $359862$

Note: isdigit$()$ returns true if a character is a digit, and false otherwise. Ex: isdigit$(\text{'}8\text{'})$ returns true. isdigit$(\text{'}$a$\text{'})$ false.