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

Ex Input:
Sentence: 'a red traffic light at a snowy corner with christmas lights in the distance'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'there is a pizza with onions mushrooms and peppers'. Count the occurrences of the word 'mushrooms' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man posing for a picture while skiing down a snowy mountain'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3