I would like the javascript to catch integers as a invalid input. Can that be done?

1 import java.util.Scanner; 3 public class Palindrome 4 args) i public static void main(String System.out.print("Enter a sentence or word to check"; Scanner reader new Scanner(System. in); String str = reader.next Line(); 10 boolean result-palindrome(str); 12 13 14 15 16 17 18 19 20 21 if(result) System.out.println(str" IS a palindrome!"; else i System.out.println(strIS NOT a palindrome!"); reader.closeO; 23 24 25 26 27 28 29 30 31 32 //Method used public static boolean palindrome(String str) String reverse ""; boolean resultfalse ""); String Str= str. replaceAll("[^a-zA-Z) ", Str = Str. toLowerCase(); int i Str.lengthO) -1; i -0; i--) reverse-reverse Str.charAt(i); for 34 35 36 37 38 if (Str.contentEquals(reverse))[ result true; } else [ 39 40 41 42 43 resultfalse; return result