Note: Character.isLetter$()$ returns true if a character is a letter, and false otherwise. Ex: Character.isLetter$(\text{'}$a$\text{'})$ returns true.

Character.isLetter$(\text{'}8\text{'})$ returns false.

public class ValidInvalid $\{$

public static void main$($String$[]$ args$)\{$

Scanner scnr $=$ new Scanner$($

System.in$)$;

String passwdStr;

V$*$ Additional variable declarations go here$*/$

passwdStr $=$ scnr$.$nextLine$()$;

$/*$ Type your additional code here $*/$

if $($isValidPasswd$)\{$

System.out.println$("$Valid$")$;

$\}$

else $\{$

System.out.println$("$Invalid$")$;