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 riding a skateboard down a street'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a room filled with a stove and surrounded by cabinets'. How many words start with the letter 'w' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a grey stripped cat on a table in a room with many books'. How many words start with the letter 'a' in the sentence.


Output: 3