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

Example Input: Sentence: 'a living room couch covered with a variety of pillows'. Count the occurrences of the word 'covered' in the given sentence.
Example Output: 1

Example Input: Sentence: 'an image of a man in a suit standing next to a cow'. Count the occurrences of the word 'image' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a skateboarder performing a trick on a stairwell'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3