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

Example Input: Sentence: 'a traffic signal is lit on the side of a city street'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a plate of salad on a table containing tuna spinach and carrot'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a bathroom has been destroyed and has holes in the wall'. Count the occurrences of the word 'been' in the given sentence.
Example Output:
1