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 zebra with a gazelle in the background in a grassy field'. Count the number of vowels in the given sentence.
Example Output: 18

Example Input: Sentence: 'a tall man eating and drinking next to a lady'. Count the number of vowels in the given sentence.
Example Output:
13