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: 'a green fire hydrant is in the middle of an open dirt hole in a construction area'. How many words start with the letter 'a' in the sentence.

SOLUTION: 4

PROBLEM: Sentence: 'two men are riding horses on a beach'. How many words start with the letter 'r' in the sentence.

SOLUTION: 1

PROBLEM: Sentence: 'buses cars and a lot of lights in the street between tall buildings'. How many words start with the letter 'b' in the sentence.

SOLUTION:
3