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 bathroom mirror reflecting a sink and bathtub'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'three black bears on or around a wooden play structure'. How many words start with the letter 's' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a lush green bark with two people sitting on top of a bench'. How many words start with the letter 'o' in the sentence.


Output: 2