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: 'several people watch cars drive by with bikes on them'. How many words start with the letter 'b' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'the two images show a bathroom sink and a stool beside a toilet'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a living room with a book shelf and a couch'. How many words start with the letter 'b' in the sentence.


Output: 1