TASK DEFINITION: In this task, you need to count the occurrences of the given word in the given sentence.
PROBLEM: Sentence: 'a brown dog sitting in front of a tv in a room'. Count the occurrences of the word 'a' in the given sentence.

SOLUTION: 3

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

SOLUTION: 2

PROBLEM: Sentence: 'a group of birds sitting on a wooden platform'. Count the occurrences of the word 'a' in the given sentence.

SOLUTION:
2