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 man pulls a rolling suitcase and is wearing a suit'. How many words start with the letter 'a' in the sentence.

SOLUTION: 4

PROBLEM: Sentence: 'two asian men standing next to a no smoking sign'. How many words start with the letter 's' in the sentence.

SOLUTION: 3

PROBLEM: Sentence: 'a young man with a surfboard walking along the beach across from a platform'. How many words start with the letter 'a' in the sentence.

SOLUTION:
5