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 couple of kids are sitting in the grass'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a horse pulling a carriage with people in the snow'. How many words start with the letter 'a' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'this is a great scene of people enjoying their life time'. How many words start with the letter 's' in the sentence.


Output: 1