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add the missing code: Read a 3 - character string from input into variable userString. Declare a Boolean variable isValid and assign isValid with true

add the missing code: Read a 3-character string from input into variable userString. Declare a Boolean variable isValid and assign isValid with true if userString does not contain any alphabetic characters. Otherwise, assign isValid with false.
Ex: If the input is -.., then isValid is assigned with true, so the output is:
String is valid
Ex: If the input is 2p3, then isValid is assigned with false, so the output is:
String is not valid import java.util.Scanner;
public class StringChecker {
public static void main(String[] args){
Scanner scnr = new Scanner(System.in);
String userString;
if (isValid){
System.out.println("String is valid");
}
else {
System.out.println("String is not valid");
}

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