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

Example Input: Sentence: 'a woman walking a large brown dog next to a tennis ball'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a sign pointing towards a mcdonalds is posted on a traffic light pole'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'some people with a bunch of hot dogs on some big forks'. Count the occurrences of the word 'hot' in the given sentence.
Example Output:
1