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 us air force sitting on a runway near a field'. How many words start with the letter 'a' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'a young woman is picking a black cat up off of the floor'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a bathroom area with a toilet trashcan and tiled floor'. How many words start with the letter 'a' in the sentence.


Output: 4