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

Ex Input:
Sentence: 'a zebra crossing the road in to the grass'. Count the occurrences of the word 'in' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a small dog wearing a bright red bow tie as a collar'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a bench next to a building on a city street'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3