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

[EX Q]: Sentence: 'a small train engine pulling a freight car'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 2

[EX Q]: Sentence: 'a hot dog that is sitting on a plate'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 2

[EX Q]: Sentence: 'a kitchen sink with a window behind it'. Count the occurrences of the word 'a' in the given sentence.
[EX A]:
2