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 man pitching a baseball from a mound to a home plate'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a lady has just about finished her plate with a knife'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a pizza with cheese mushrooms hamburger and parsley'. How many words start with the letter 'p' in the sentence.


Output: 2