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

Ex Input:
Sentence: 'a red truck hauling a truck behind it on a highway'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3

Ex Input:
Sentence: 'a man in a pitching pose with a glove near another man with a glove'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
4

Ex Input:
Sentence: 'a bald headed man cutting a ribbon in front of people on bicycles'. Count the occurrences of the word 'man' in the given sentence.

Ex Output:
1