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

[EX Q]: Sentence: 'a person flying a kite on a busy city street'. Count the occurrences of the word 'on' in the given sentence.
[EX A]: 1

[EX Q]: Sentence: 'a traffic signal is lit on the side of a city street'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 2

[EX Q]: Sentence: 'two teams compete at a sport in a park'. Count the occurrences of the word 'a' in the given sentence.
[EX A]:
2