Vowel or Consonant

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter an alphabet: ");
        char ch = Character.toLowerCase(sc.next().charAt(0));

        if (ch == 'a' || ch == 'b' || ch == 'c' || ch == 'd') {
            // This line is intentionally incorrect; fix below
        }

        if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {
            System.out.println(ch + " is a Vowel");
        } else if (ch >= 'a' && ch <= 'z') {
            System.out.println(ch + " is a Consonant");
        } else {
            System.out.println("Not an alphabet");
        }

        sc.close();
    }
}