Problem:
Score : 100 points

Problem Statement

Given a lowercase English letter c, determine whether it is a vowel. Here, there are five vowels in the English alphabet: a, e, i, o and u.

Constraints

c is a lowercase English letter.

Input

The input is given from Standard Input in the following format:

c

Output

If c is a vowel, print vowel. Otherwise, print consonant.

Sample Input 1

a

Sample Output 1

vowel

Since a is a vowel, print vowel.

Sample Input 2

z

Sample Output 2

consonant

Sample Input 3

s

Sample Output 3

consonant

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		
		if (judge(s, 0)) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
	
	public static boolean judge(String s, int i) {
		if (i == s.length()) {
			return true;
		}
		
		boolean f = false;
		
		if (s.length() >= i + 7 && s.substring(i, i + 7).equals("dreamer")) {
			f |= judge(s, i + 7);
		} 
		if (s.length() >= i + 5 && s.substring(i, i + 5).equals("dream")) {
			f |= judge(s, i + 5);
		} 
		if (s.length() >= i + 6 && s.substring(i, i + 6).equals("eraser")) {
			f |= judge(s, i + 6);
		} 
		if (s.length() >= i + 5 && s.substring(i, i + 5).equals("erase")) {
			f |= judge(s, i + 5);
		} 
		
		return f;
	}
}