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

Example Input: Sentence: 'well made salad on a white plate and a wine glass besides'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a plate of food with bread fried crab cole slaw a lemon tomato pickle and lettuce on it'. Count the occurrences of the word 'of' in the given sentence.
Example Output: 1

Example Input: Sentence: 'a giraffe eats from the grass near large rocks on the ground'. Count the occurrences of the word 'grass' in the given sentence.
Example Output:
1