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

Ex Input:
Sentence: 'a baseball player is running in a field'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'on a road a person is going with an umbrellamany cars are also seen'. Count the occurrences of the word 'seen' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man with two tennis balls and a racket on a tennis court'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3