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 fire hydrant beside a burned building in a city'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a bathroom with a toilet with a blue seat'. How many words start with the letter 'b' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a green mail box sitting next to a white brick building'. How many words start with the letter 'b' in the sentence.


Output: 3