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

Example Input: Sentence: 'a tea kettle that is sitting on a stove'. Count the occurrences of the word 'kettle' in the given sentence.
Example Output: 1

Example Input: Sentence: 'black and white photo of a person with an umbrella on a dock'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a baseball game with a left handed batter swinging at a pitch and the catcher and umpire behind him'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3