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

Ex Input:
Sentence: 'a kid is riding a bike down a narrow street'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a fudge brownie with chocolate chips sits near a threeprong fork'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a bridge on a river with a city in the skyline'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3