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

[Q]: Sentence: 'a man at a bar tasting wine that is lined out on the bar counter top'. Count the occurrences of the word 'on' in the given sentence.
[A]: 1


[Q]: Sentence: 'a single lone cup of coffee sitting on a black park bench'. Count the occurrences of the word 'a' in the given sentence.
[A]: 2


[Q]: Sentence: 'a flock of blackfaced sheep near a watering trough on a rural hillside'. Count the occurrences of the word 'a' in the given sentence.
[A]:
3