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

Ex Input:
Sentence: 'a man tossing a frisbee to another man to catch'. Count the occurrences of the word 'to' in the given sentence.

Ex Output:
2

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: 'a number of animals in a field at a feeding bin'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3