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

Input: Consider Input: Sentence: 'a traffic signal is lit on the side of a city street'. Count the occurrences of the word 'a' in the given sentence.

Output: 2


Input: Consider Input: Sentence: 'a young boy at a picnic table is holding half a donut'. Count the occurrences of the word 'a' in the given sentence.

Output: 3


Input: Consider Input: Sentence: 'a person sitting at a desk with a laptop'. Count the occurrences of the word 'a' in the given sentence.


Output: 3