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 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 number of motorcycles are on display at a museum'. How many words start with the letter 'o' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a large white transport truck driving down a dirt road'. How many words start with the letter 'd' in the sentence.


Output: 3