Vowel or consonant

import java.util.Scanner;
public class Exercise4_13VowelOrConsonant {

    public static void main(String[] args) {
        Scanner kb = new Scanner(System.in);
        System.out.println("enter a letter");
        String character = kb.next();
        char ch = character.charAt(0);
        ch = Character.toUpperCase(ch);
        if (Character.isLetter(ch)){
            if (ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U')
                System.out.println(ch + " is a vowel");
            else
                System.out.println(ch + " is a consonant");
        }
        else
            System.out.println(ch +" is not a letter");

    }

}