TASK DEFINITION: In this task, you need to count the occurrences of the given word in the given sentence.
PROBLEM: Sentence: 'a group of fire trucks ride down the road'. Count the occurrences of the word 'a' in the given sentence.

SOLUTION: 1

PROBLEM: Sentence: 'a gray bird about to perch on a branch'. Count the occurrences of the word 'a' in the given sentence.

SOLUTION: 2

PROBLEM: Sentence: 'a crowd of people standing next to a bus'. Count the occurrences of the word 'a' in the given sentence.

SOLUTION:
2