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: 'cars and a motorcycle waiting at an intersection'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'kids at a skateboard park riding skateboards and watching'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a blue sky with some planes flying through the air'. How many words start with the letter 'a' in the sentence.


Output: 2