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 police officer is standing on a street corner'. Count the number of vowels in the given sentence.
Example Output: 16

Example Input: Sentence: 'a bunch of desserts sitting on a table next to a drink'. Count the number of consonants in the given sentence.
Example Output: 28

Example Input: Sentence: 'a herd of wild animals grazing on grass next to a lake'. Count the number of vowels in the given sentence.
Example Output:
16