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

Example Input: Sentence: 'a man riding skis on a snow covered ski slope'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'teo women in all white playing tennis on a tennis court'. Count the occurrences of the word 'tennis' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a yellow emergency until vehicle in a parking ot'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
2