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

Example Input: Sentence: 'a hotdog with a bite taken out on a napkin'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a white toilet in a very small room'. Count the occurrences of the word 'very' in the given sentence.
Example Output: 1

Example Input: Sentence: 'close up of a garden with shrubs growing'. Count the occurrences of the word 'of' in the given sentence.
Example Output:
1