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

Example Input: Sentence: 'black and white picture of a steam engine on a flooded track'. Count the occurrences of the word 'picture' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a street sign hanging from a pole that reads hampsire under a dark sky'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a pizza sitting in a box next to a container of sauce'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3