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 black and white cat sits in a bathroom sink'. How many words start with the letter 'a' in the sentence.

Output: 3


Input: Consider Input: Sentence: 'a cat standing on a suitcase and checking out peoples bags'. How many words start with the letter 's' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'many cars and a bus driving down the road'. How many words start with the letter 'r' in the sentence.


Output: 1