TASK DEFINITION: In this task, you need to count the number of words in a sentence that start with the given letter. Answer with numbers and not words.
PROBLEM: Sentence: 'this is an image of a group of people in a city'. How many words start with the letter 'a' in the sentence.

SOLUTION: 3

PROBLEM: Sentence: 'a man and three children playing with a kite on the grass and other people riding bikes on a nearby road'. How many words start with the letter 'a' in the sentence.

SOLUTION: 5

PROBLEM: Sentence: 'a man wheels a green motorbike and a boy walks behind'. How many words start with the letter 'a' in the sentence.

SOLUTION:
4