Thread: Illegal start of expression

trying to take char input and display whether a vowel

i get error saying that enum has illegal start of expression and that it must not be local

boolean.java:6: illegal start of expression
public enum vowels
^

boolean.java:6:enum types must not be local
public enum vowels
^

im really new and i dont know what ive done

public class Boolean {
 
	public static void main (String[] args) {
 
		public enum vowels {
		A('a'),E('e'),I('i'),O('o'),U('u');
		}
		char letterinput;
	        boolean isVowel;
		System.out.print("Enter a letter: ");
		int c = System.in.read();
		letterinput = (char)c;
		while(System.in.available() > 0) { 
		System.in.read(); 
		}
		if (letterinput == vowels) {
		isVowel = true;
		System.out.println(letterinput + "is a vowel");
		} else {
		isVowel = false;
		System.out.println(letterinput + "is not a vowel");
		}
	}
}

I have seen the tutorial and I`m pretty sure I have copied the syntax to the letter unless you actually have to have each constant on a new line, also upon moving the enum outside the method the compiler then fails to recognise the vowels identifier