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

Input: Consider Input: Sentence: 'a group of kids swimming in ocean around a man on a surfboard'. Count the occurrences of the word 'a' in the given sentence.

Output: 3


Input: Consider Input: Sentence: 'a small grey bird eating food from paper plates on a picnic table'. Count the occurrences of the word 'small' in the given sentence.

Output: 1


Input: Consider Input: Sentence: 'a bird is perched on the top of a book'. Count the occurrences of the word 'a' in the given sentence.


Output: 2