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 street sign against a smoggy palm tree filled sky'. How many words start with the letter 's' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a woman is holding the hand of a boy who is leaning on a fire hydrant'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'montage color photograph of helmeted motorcycle riders and a rural fire station'. How many words start with the letter 'r' in the sentence.


Output: 2