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

Example Input: Sentence: 'a woman in a red shirt holding a cup of coffee and a donut'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 4

Example Input: Sentence: 'the father and son are looking at the kites flying overhead'. Count the occurrences of the word 'the' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a man holding a para sail chute across from a board'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3