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

Ex Input:
Sentence: 'a night scene of a secluded  street with nearby parking garage'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'picture of a tab tub where the wall is open exposing wood studs and a shop vacuum is in the tub'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man is using a banana as a smiling mouth'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3