Count Vowels in a String

Given a string S, your task is to count the number of vowels in the string. The vowels are defined as \(\{a, e, i, o, u\}\) and the count is case-insensitive. That is, both uppercase and lowercase vowels should be counted.

You can compute the count using the formula:

[ \text{count} = \sum_{c \in S} [c \in {a, e, i, o, u}] ]

Read the input from standard input (stdin) and write the output to standard output (stdout).

inputFormat

The input consists of a single line containing the string S. The string may include spaces, punctuation, and other characters.

outputFormat

Output a single integer representing the number of vowels in the input string.

Hello World

3