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

Q: Sentence: 'a pizza is on a cooling rack on a counter'. Count the occurrences of the word 'on' in the given sentence.

A: 2
****
Q: Sentence: 'a stuffed animal sits in front of a sheet'. Count the occurrences of the word 'a' in the given sentence.

A: 2
****
Q: Sentence: 'a black desk topped with a laptop computer and a monitor'. Count the occurrences of the word 'a' in the given sentence.

A:
3
****