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: 'an image of a clock that is next to a group of books'. Count the number of consonants in the given sentence.
Example Output: 23

Example Input: Sentence: 'a white ferret laying its head on a remote control'. Count the number of consonants in the given sentence.
Example Output: 24

Example Input: Sentence: 'a person riding a skate board at a skate park'. Count the number of consonants in the given sentence.
Example Output:
21