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

Example Input: Sentence: 'a white and gray cat is in a bathroom sink'. Count the occurrences of the word 'white' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a pig in a make shift shelter being watched by a cat'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a woman on a green court with a racquet'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3