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

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 red passenger bus drives down a busy road'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a close up of different plates of food'. Count the occurrences of the word 'of' in the given sentence.

Ex Output:

2