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 Ruby (2.3.3) (judge verdict: Wrong Answer)

io = STDIN
s=io.gets.chomp
$ar= %w(dreamer dream eraser erase)
def check(s)
  while true
    return false if $ar.none?{|st|s.end_with?(st)}
    $ar.each do |st|
      if s.end_with?(st)
        s = s[0..-(st.size+1)]
        return true if s.size==0
      end
    end
  end
end
puts check(s) ? "YES" : "NO"