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

Ex Input:
Sentence: 'a cat is standing on a green bench looking on'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'there are many people that are riding a elephant'. Count the occurrences of the word 'are' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a fire hydrant next to a rock outdoors in a natural area'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3