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

[Q]: Sentence: 'a surfer wearing a green shirt holds his surf board and looks out at the boats in the ocean'. Count the occurrences of the word 'a' in the given sentence.
[A]: 2


[Q]: Sentence: 'this is a dog sitting on a reclining chary with a pillow'. Count the occurrences of the word 'a' in the given sentence.
[A]: 3


[Q]: Sentence: 'a red and a white train cab on a rusty train track'. Count the occurrences of the word 'rusty' in the given sentence.
[A]:
1