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

[Q]: Sentence: 'a man puts his head on his cat sitting on a suitcase'. Count the occurrences of the word 'a' in the given sentence.
[A]: 2


[Q]: Sentence: 'a picture of a toilet and toilet paper in a bathroom'. Count the occurrences of the word 'a' in the given sentence.
[A]: 3


[Q]: Sentence: 'a desk with shelves and a laptop and a desktop computer'. Count the occurrences of the word 'a' in the given sentence.
[A]:
3