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: 'an airplane as it is taking off and is ascending into space'. How many words start with the letter 'a' in the sentence.

Output: 5


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: 'cows chained in a barn are eating dry grass'. How many words start with the letter 'c' in the sentence.


Output: 2