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

Example Input: Sentence: 'a red and white stop sign and a black and white sign and a building'. Count the occurrences of the word 'and' in the given sentence.
Example Output: 4

Example Input: Sentence: 'a reflection of a wild animal in a side view mirror'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a man holding a baseball glove with a ball in it'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3