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: 'people walking down the street while some people ride their bicycles'. How many words start with the letter 'w' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'three people in suits are standing and holding surfboards'. How many words start with the letter 's' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a large bed with white sheets is unmade'. How many words start with the letter 'b' in the sentence.


Output: 1