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

Example Input: Sentence: 'a person sitting down in front of a couch'. Count the occurrences of the word 'in' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a young boy in a green baseball uniform holding a baseball bat'. Count the occurrences of the word 'baseball' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a blue plate with an orange a cracker some lettuce and a twist bar'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3