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

Example Input: Sentence: 'a person watching television showing a big bird on the screen'. Count the occurrences of the word 'screen' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a cat laying on a blanket  by two wii remotes'. Count the occurrences of the word 'laying' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a home computer setup with two laptops on a desk'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
2