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 man in a cowboy hat attempts to throw a disc shaped object'. Count the number of consonants in the given sentence.
Example Output: 31

Example Input: Sentence: 'two cows relax and graze in a large grassy pasture'. Count the number of vowels in the given sentence.
Example Output:
15