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

[EX Q]: Sentence: 'a black train is on a train track near some foothills'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 2

[EX Q]: Sentence: 'a man with a racket leaps in the air to hit a ball'. Count the occurrences of the word 'racket' in the given sentence.
[EX A]: 1

[EX Q]: Sentence: 'a young woman and a boy taking care of a baby elephant'. Count the occurrences of the word 'a' in the given sentence.
[EX A]:
3