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

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

Ex Output:
1

Ex Input:
Sentence: 'a pink toothbrush and a blue toothbrush sitting in a clear glass toothbrush holder by a mirror'. Count the occurrences of the word 'toothbrush' in the given sentence.

Ex Output:
3

Ex Input:
Sentence: 'a box of pizza in a persons hand'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2