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

Example Input: Sentence: 'an image of two people playing a video game'. Count the occurrences of the word 'people' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a black counter top of a stove inside a kitchen'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a girl on a platform next to a passenger train'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3