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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Linq;
using System.Text.RegularExpressions;

namespace AtCoder {
    class Program {
        static void Main (string[] args) {

            string c = Console.ReadLine();
            string ans = string.Empty;
            string[] vowels = new string[] { "a","e","i","o","u"};

            if ( 0 <= Array.IndexOf(vowels,c))
            {
                ans = "vowel";
            }
            else
            {
                ans = "consonant";
            }

            Console.WriteLine(ans);
        }
    }
}