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

Example Input: Sentence: 'a pedestal sink and a toilet in a bathroom'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a man eats food at a bench in front of a boat'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a series where three elephants are playing with each other'. Count the occurrences of the word 'other' in the given sentence.
Example Output:
1