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 Python (3.4.3) (judge verdict: Wrong Answer)

s = input()
s = s[::-1]
t_list = ['dream', 'dreamer', 'erase', 'eraser']
t_list = [i[::-1] for i in t_list]
i = 0

while i <= len(s)+1:
    can = False
    for j in range(4):
        if s[i:len(t_list[j])] == t_list[j]:
            i+=len(t_list[j])
            can = True
    if can == False:
        break

if can == True:
    print('YES')
else:
    print('NO')