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

Example Input: Sentence: 'this outside the capitol building where people are flying kites'. Count the occurrences of the word 'this' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a commuter train running under a bridge along urban tracks'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a wooden pedestrian sign mounted in a downtown setting'. Count the occurrences of the word 'sign' in the given sentence.
Example Output:
1