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 green mail box sitting next to a white brick building'. How many words start with the letter 'b' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a boy wearing blue has a skateboard in the air near a black railing'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a person is standing by a pier near a fire hydrant'. How many words start with the letter 'p' in the sentence.


Output: 2