Given a English alphabet c, Write a program to check whether a character is a vowel or not.

Example 1:
Input:
c = 'a'
Output:
YES
Explanation:
'a' is a vowel.

Example 2:
Input:
c = 'Z'
Output:
NO
Explanation:
'Z' is not a vowel.

Your Task:
You don't need to read input or print anything. Your task is to complete the function isVowel() which takes a character c and returns 'YES' or 'NO'.

Expected Time Complexity: O(1)
Expected Auxiliary Space: O(1)

Note: c is either lowercase or uppercase English alphabetic character
Constraints:
c belongs to English Alphabets.

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