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

Input: Consider Input: Sentence: 'a small child sitting in a seat with a bag'. Count the occurrences of the word 'a' in the given sentence.

Output: 3


Input: Consider Input: Sentence: 'a dog catching a frisbee on a baseball field while its owner watches'. Count the occurrences of the word 'a' in the given sentence.

Output: 3


Input: Consider Input: Sentence: 'a couple of people on a street with a bus'. Count the occurrences of the word 'a' in the given sentence.


Output: 3