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

[EX Q]: Sentence: 'a man holding a frisbee in front of a teen boy with his arms up in the air'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 3

[EX Q]: Sentence: 'a girl is holding a large kite on a grassy field'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 3

[EX Q]: Sentence: 'a black cat is sitting on an office chair'. Count the occurrences of the word 'office' in the given sentence.
[EX A]:
1