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

Input: Consider Input: Sentence: 'a crowd of people standing next to a bus'. Count the occurrences of the word 'a' in the given sentence.

Output: 2


Input: Consider Input: Sentence: 'a bus waits by a curb next to some trees'. Count the occurrences of the word 'a' in the given sentence.

Output: 2


Input: Consider Input: Sentence: 'a man is jumping to catch a frisbee he is playing with'. Count the occurrences of the word 'is' in the given sentence.


Output: 2