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

[Q]: Sentence: 'a horse out in a grassy green field'. Count the occurrences of the word 'a' in the given sentence.
[A]: 2


[Q]: Sentence: 'a person wearing a suit and tie next to a woman in a dress'. Count the occurrences of the word 'tie' in the given sentence.
[A]: 1


[Q]: Sentence: 'a woman walking a large brown dog next to a tennis ball'. Count the occurrences of the word 'a' in the given sentence.
[A]:
3