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 cat inside a window looking out near another cat'. How many words start with the letter 'n' in the sentence.

Output: 1


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: 'black and white public bathroom stall with toilet facilities'. How many words start with the letter 'w' in the sentence.


Output: 2