Vowel Contest Winner

You are given a string S. Your task is to determine whether the string S starts and ends with a lowercase vowel. The vowels are defined as \(\{a, e, i, o, u\}\). If both the first and the last characters of S are vowels, print "YES"; otherwise, print "NO".

Note: The input string is expected to be in lowercase. Uppercase letters are not considered vowels for the purpose of this problem.

Examples:

• For input apple, the output is YES since 'a' and 'e' are vowels.
• For input banana, the output is NO because it does not start with a vowel.
• For input kiwi, the output is NO since it does not end with a vowel.

inputFormat

The input consists of a single line containing the string S. The string will only contain English letters.

outputFormat

Output a single line containing either YES if both the first and last characters of the string are vowels, or NO otherwise.

apple

YES