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

Example Input: Sentence: 'a single lone cup of coffee sitting on a black park bench'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a bowl of soup on a white table in front of vegetables'. Count the occurrences of the word 'of' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a woman is on a surf board surfing a wave'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3