C$++$ A website requires that passwords only contain alphabetic characters. For each character in codeStr that is not an alphabetic character, replace the character with $\text{'}$x$\text{'}.$

Ex: If the input is s@C$w$,$ then the output is:

Adjusted password: sxCxw

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