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

Example Input: Sentence: 'a yellow emergency until vehicle in a parking ot'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a sandwich with meat and sauce on a plate'. Count the occurrences of the word 'sauce' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a boy is cutting things out of a magazine'. Count the occurrences of the word 'of' in the given sentence.
Example Output:
1