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

[Q]: Sentence: 'a couple of horses standing on a grass covered field'. Count the occurrences of the word 'on' in the given sentence.
[A]: 1

[Q]: Sentence: 'a gray bird about to perch on a branch'. Count the occurrences of the word 'a' in the given sentence.
[A]: 2

[Q]: Sentence: 'a baseball player holding a bat on top of a baseball field'. Count the occurrences of the word 'baseball' in the given sentence.
[A]:
2