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 zeppelin flying in the air as a water spouts occurs in a city lake'. How many words start with the letter 'a' in the sentence.

Output: 5


Input: Consider Input: Sentence: 'a man serves the ball during a claycourt tennis match'. How many words start with the letter 'm' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a group of motorcycles passing a truck on a town street'. How many words start with the letter 'a' in the sentence.


Output: 3