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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>

int main(void)
{
    char c[2];
    char aiueo[] = "aiueo";
    int i;
    scanf("%s", c);
    for(i = 0; i < strlen(aiueo); i++){
        if (c[0] == aiueo[i]) {
            printf("vowel\n");
            break ;
        }
        if (i == strlen(aiueo)-1) {
            printf("constant\n");
        }
    }

    return 0;
}