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: 'this is a living room table with several large chairs placed around it'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'an older airplane flying above buildings and fields'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a street with traffic lights street signs and advertisements on it'. How many words start with the letter 's' in the sentence.


Output: 3