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

Ex Input:
Sentence: 'a dog is sleeping in a bed underneath a desk'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a stuffed animal sitting on a chair in front of a laptop'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'street corner with lots of different directional signs'. Count the occurrences of the word 'of' in the given sentence.

Ex Output:

1