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

Ex Input:
Sentence: 'a person with a scarf on their head sitting on a bench next to flowers with their hand raised'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a person taking a photo of a person brushing her teeth'. Count the occurrences of the word 'of' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a young man tossing a frisbee in a  forest'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3