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

Input: Consider Input: Sentence: 'a child in a blue helmet standing on a skateboard indoors'. Count the occurrences of the word 'a' in the given sentence.

Output: 3


Input: Consider Input: Sentence: 'a person on a surfboard riding a wave on the ocean'. Count the occurrences of the word 'a' in the given sentence.

Output: 3


Input: Consider Input: Sentence: 'three people at a meeting looking at their computers'. Count the occurrences of the word 'a' in the given sentence.


Output: 1