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

Ex Input:
Sentence: 'a colorful hydrant  sitting in the grass on a quiet street'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a brown dog sitting in front of a tv in a room'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man with glasses a collar shirt and a tie on'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3