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

Example Input: Sentence: 'a couple of skis sticking out of a snow covered ground'. Count the occurrences of the word 'of' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a cat is sitting near a laptop in a room'. Count the occurrences of the word 'laptop' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a man wearing a tie poses for a picture'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3