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 cat that is sleeping on a chair'. Count the number of consonants in the given sentence.
Example Output: 15

Example Input: Sentence: 'a cyclist squats beside a bull on a grassy hillside'. Count the number of vowels in the given sentence.
Example Output: 15

Example Input: Sentence: 'a man on a speedboat with a red umbrella'. Count the number of consonants in the given sentence.
Example Output:
18