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

[EX Q]: Sentence: 'a man with a long grey beard in a white shirt and green tie at a pub full of greenshirted patrons'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 4

[EX Q]: Sentence: 'a furry dog standing next to a fire hydrant'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 2

[EX Q]: Sentence: 'a cat playing with a potted plant in front of a window'. Count the occurrences of the word 'a' in the given sentence.
[EX A]:
3