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 herd of sheep is on the side of the road and a bus drives through'. Count the number of vowels in the given sentence.
Example Output: 21

Example Input: Sentence: 'two food trucks parked and awaiting customers near a bunch of trees'. Count the number of vowels in the given sentence.
Example Output: 21

Example Input: Sentence: 'a train pulling into a train station platform'. Count the number of consonants in the given sentence.
Example Output:
23