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 slice of pepperoni pizza sits on a paper plate'. Count the number of vowels in the given sentence.
Example Output: 17

Example Input: Sentence: 'a pair of men fighting over a frisbee in a grassy field'. Count the number of consonants in the given sentence.
Example Output: 26

Example Input: Sentence: 'skateboarder going down the side of a rail in a city'. Count the number of vowels in the given sentence.
Example Output:
18