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

Example Input: Sentence: 'a desk with a laptop computer monitor and various other items'. Count the occurrences of the word 'other' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a man standing on some rocks holding a surfboard'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a safari setting at a zoo with two giraffes and a zebra'. Count the occurrences of the word 'a' in the given sentence.
Example Output:
3