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

[EX Q]: Sentence: 'a home office features full bookcase a laptop and a red leather chair'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 3

[EX Q]: Sentence: 'real to life dummy stuffed into a suitcase'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 1

[EX Q]: Sentence: 'a clock on a tower on a city street'. Count the occurrences of the word 'a' in the given sentence.
[EX A]:
3