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

Sentence: 'a red truck hauling a truck behind it on a highway'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'a man on a snowboard who is performing a trick'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'a person on a snowboard skiing down the slopes'. Count the occurrences of the word 'a' in the given sentence.

2