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: 'three black cows standing next to each other on a field'. Count the number of vowels in the given sentence.
16

Sentence: 'people of various ages play tennis, hold tennis balls and swing their racquets'. Count the number of consonants in the given sentence.
41

Sentence: 'black and white photograph of people skiing in a competition'. Count the number of vowels in the given sentence.

20