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.

[EX Q]: Sentence: 'a couple of horses are standing in a field'. Count the number of vowels in the given sentence.
[EX A]: 15

[EX Q]: Sentence: 'a street sign and a traffic light in front of a building'. Count the number of consonants in the given sentence.
[EX A]: 29

[EX Q]: Sentence: 'sheep graze on the side of a steep, rocky hillside'. Count the number of vowels in the given sentence.
[EX A]:
16