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

[Q]: Sentence: 'a red passenger bus drives down a busy road'. Count the occurrences of the word 'a' in the given sentence.
[A]: 2


[Q]: Sentence: 'two females and one is throwing a yellow frisbee and the other a red one'. Count the occurrences of the word 'yellow' in the given sentence.
[A]: 1


[Q]: Sentence: 'a pizza laying on an open box with a slice missing'. Count the occurrences of the word 'on' in the given sentence.
[A]:
1