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 photo of a waterway with several boats along the shore'. How many words start with the letter 'w' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a black bear walks in front of a tree in a forest'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a black cat sitting inside of a purse'. How many words start with the letter 'b' in the sentence.


Output: 1