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

Example Input: Sentence: 'a man with a fake red nose holds a giant sunflower'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a number of birds in a cage handing from a pole'. Count the occurrences of the word 'handing' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a whit microwave on top of a counter in a kitchen'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3