Count Vowels in a String

You are given a string and you are required to count the number of vowels in it. Vowels are considered to be a, e, i, o, u in both uppercase and lowercase forms. Consider the formula \( V = \sum_{i=1}^{n} \mathbb{1}(s_i \in \{a,e,i,o,u,A,E,I,O,U\}) \) where \(\mathbb{1}(condition)\) is 1 if the condition holds and 0 otherwise.

If the input string is empty, the output should be 0.

Your solution should read from stdin and output the result to stdout.

inputFormat

The input consists of a single line containing a string s. This string may include letters, spaces, and other characters.

The string is provided through stdin.

outputFormat

Output a single integer representing the number of vowels present in the input string. The result should be printed to stdout.

hello

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