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: '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: 'two men are riding horses on a beach'. How many words start with the letter 'r' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a skier stands at the top of a mountain'. How many words start with the letter 'a' in the sentence.


Output: 3