In this task, you need to count the occurrences of the given word in the given sentence.

Sentence: 'a man and a woman riding a motorcycle next to a crowd'. Count the occurrences of the word 'a' in the given sentence.
4

Sentence: 'a woman on a tennis court playing tennis with a racket'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'a room with a television a desk and some chairs'. Count the occurrences of the word 'a' in the given sentence.

3