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

Input: Consider Input: Sentence: 'a cyclist travels down a leaf strewn path in a park'. Count the occurrences of the word 'a' in the given sentence.

Output: 3

Input: Consider Input: Sentence: 'several young men playing a game on the grass near a body of water on a chilly day'. Count the occurrences of the word 'a' in the given sentence.

Output: 3

Input: Consider Input: Sentence: 'a white dog with a black eye laying on a blanket'. Count the occurrences of the word 'a' in the given sentence.
Output: 3