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 terrier in a black and light brown far next to each other'. How many words start with the letter 'b' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a boy waves at the camera standing on a tree stump'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a bunch of clock sitting on a mantel'. How many words start with the letter 'o' in the sentence.


Output: 2