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: 'people on a tour bus with half the top cut off'. How many words start with the letter 'b' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a horse pulling a carriage with people in the snow'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a bus traveling down the street during the day'. How many words start with the letter 'd' in the sentence.


Output: 3