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 cow crosses a stream while sun rays shine down on the water'. Count the number of vowels in the given sentence.
18

Sentence: 'a group of people are attending a wedding'. Count the number of vowels in the given sentence.
15

Sentence: 'a lot of people that are in the snow'. Count the number of vowels in the given sentence.

12