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 man riding a ramp on a skateboard at a park'. Count the number of consonants in the given sentence.
20

Sentence: 'two girls who are both biting a chocolate doughnut'. Count the number of consonants in the given sentence.
26

Sentence: 'a stop sign in front of the trees'. Count the number of vowels in the given sentence.

9