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

Example Input: Sentence: 'four giraffes stand around the grassy area of a corral'. Count the occurrences of the word 'giraffes' in the given sentence.
Example Output: 1

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 painting of a man and child flying kites'. Count the occurrences of the word 'child' in the given sentence.
Example Output:
1