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: '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 group of four people are riding a ski lift as they ride over the snowy mountain'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'th groom kisses the bride on a bench near the ocean'. How many words start with the letter 'b' in the sentence.


Output: 2