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 young man wearing glasses with a tooth brush in his mouth'. How many words start with the letter 'b' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a group of young people riding snow boards down a snow covered hillside'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'books and snacks resting on and around a small table'. How many words start with the letter 'a' in the sentence.


Output: 4