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

Ex Input:
Sentence: 'a desktop computers sitting on a desk next to a laptop'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a person doing a jump on a snowboard'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man performs a flip trick on a skateboard'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3