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 man without a shirt riding a skateboard'. How many words start with the letter 'r' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a box with three foot long hot dogs inside of it'. How many words start with the letter 'i' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a pile of luggage on wooden floor next to dresser'. How many words start with the letter 'a' in the sentence.


Output: 1