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

Example Input: Sentence: 'two adults on skis with a child on skis between them'. Count the occurrences of the word 'on' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a woman sitting on a couch holding a wii game controller'. Count the occurrences of the word 'wii' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a tabby cat stretches out sleepily next to a laptop computer'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
2