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.

Sentence: 'a person riding a motorcycle on sandy hills'. Count the number of consonants in the given sentence.
24

Sentence: 'some people are looking at two giraffes at a zoo'. Count the number of consonants in the given sentence.
20

Sentence: 'three small sheep are standing on a road'. Count the number of consonants in the given sentence.

20