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

Example Input: Sentence: 'a stuffed animal sitting on a chair in front of a laptop'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a kitchen with a counter a double sink and lights'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a woman hitting a tennis ball with a racquet'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3