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

Example Input: Sentence: 'a orange cat sleeping on top of a blanket'. Count the occurrences of the word 'blanket' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a man with glasses a collar shirt and a tie on'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a man prepares to cut a cake at his birthday celebration'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
2