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: 'a person takes a picture of a reflection in a mirror in the dark'. How many words start with the letter 'p' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a man using a laptop computer on a table'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a prison toilet and sink are bare bones and on a floor in disrepair'. How many words start with the letter 'b' in the sentence.


Output: 2