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

Example Input: Sentence: 'a white dog and a person with an umbrella and red jacket'. Count the occurrences of the word 'and' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a truck and a part of a disabled plane'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a woman photographing a tabby cat on the hood of a car'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3