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 door is closed with a sign on it glass cover'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a couple of giraffes that are walking around'. How many words start with the letter 'c' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a group of train engines on a large set of tracks'. How many words start with the letter 't' in the sentence.


Output: 2