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

Ex Input:
Sentence: 'a couple of elephants out in the field having a snack'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'several boats parked near the rivers edge letting passengers off'. Count the occurrences of the word 'rivers' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man holding a pizza at a protest'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3