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 little white airplane that is parked on some concrete'. How many words start with the letter 'p' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a person kneeling down under a green umbrella'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a young man laying on top of a white toilet seat near a sink'. How many words start with the letter 'a' in the sentence.


Output: 3