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.

Input: Consider Input: Sentence: 'woman sitting at top of stairs talking on phone and smoking a cigarette'. How many words start with the letter 's' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'red bananas and sliced apples sit on a carving board'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'an old building stretches high into the sky above'. How many words start with the letter 'a' in the sentence.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Output: 2


