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

Ex Input:
Sentence: 'a close up of a person riding skis on a body of water'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'two zebras in a dirt field looking for food'. Count the occurrences of the word 'for' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a picture of a dark figure looking at a tooth brush'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3