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

Ex Input:
Sentence: 'someone is holding up a hot dog with cheese on a bun'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a large chair statue with a large horse statue on top of it'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a person holding up a smart phone in front of a singer'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3