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 truck and an ambulance driving down the street'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'plates of different kind of food and a group of people on a picnic table'. How many words start with the letter 't' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a pitcher throwing a ball to a batter during a baseball game'. How many words start with the letter 'b' in the sentence.


Output: 3