In this task, you need to count the number of vowels (letters 'a', 'e', 'i', 'o', 'u') / consonants (all letters other than vowels) in the given sentence.

Example Input: Sentence: 'a man riding a wind board in the middle of an ocean'. Count the number of vowels in the given sentence.
Example Output: 17

Example Input: Sentence: 'a dog sitting  in a piece of luggage on a floor'. Count the number of vowels in the given sentence.
Example Output: 17

Example Input: Sentence: 'woman sitting on a horse walking on gravel'. Count the number of vowels in the given sentence.
Example Output:
13