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 fighter jet on a runway with a cover over the cockpit'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'some signs buildings trees bushes a green and white sign'. How many words start with the letter 's' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a person is finishing a slice of pizza from a mostly uneaten one in front of him'. How many words start with the letter 'p' in the sentence.


Output: 2