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

Input: Consider Input: Sentence: 'a man wearing a white helmet is riding a red motorcycle'. Count the occurrences of the word 'a' in the given sentence.

Output: 3


Input: Consider Input: Sentence: 'a man standing in front of a jet engine'. Count the occurrences of the word 'a' in the given sentence.

Output: 2


Input: Consider Input: Sentence: 'a close up of a tennis player with a scary mask on'. Count the occurrences of the word 'a' in the given sentence.


Output: 3