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 ladder sitting up against a red wall in a room'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'an elephant standing in front of some trees with its trunk in the air'. How many words start with the letter 's' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a young child sits at the table and scoops food out of a can with a spoon'. How many words start with the letter 's' in the sentence.


Output: 3