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 red and white double decker bus parked in front of a building'. How many words start with the letter 'b' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a large jet liner sitting on top of an airport runway'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a wooden bench in a forest clearing at sunset'. How many words start with the letter 'a' in the sentence.


Output: 3