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

Ex Input:
Sentence: 'a cyclist travels down a leaf strewn path in a park'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'the person is taking a picture in the mirror while riding in the car'. Count the occurrences of the word 'the' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a black dog carrying a frisbee in its mouth'. Count the occurrences of the word 'dog' in the given sentence.

Ex Output:

1