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

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: 'the father and son are looking at the kites flying overhead'. Count the occurrences of the word 'the' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a man playing a game of frisbee on a green lawn'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3

