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 boy waves at the camera standing on a tree stump'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a plate has ribs broccoli and mashed potatoes on a plate'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'an orange striped cat drinking water out of a toilet'. How many words start with the letter 'a' in the sentence.


Output: 2