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 person skiing down a steep snowy hill'. Count the number of vowels in the given sentence.
Example Output: 11

Example Input: Sentence: 'two plates of pasties and cups of tea on a table'. Count the number of vowels in the given sentence.
Example Output: 16

Example Input: Sentence: 'a pizza sitting outside on a stone bench'. Count the number of vowels in the given sentence.
Example Output:
14