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.

Ex Input:
Sentence: 'a group of people sitting at a restaurant table'. How many words start with the letter 'a' in the sentence.

Ex Output:
3

Ex Input:
Sentence: 'here is an asian standing by a yellow fire hydrant'. How many words start with the letter 'h' in the sentence.

Ex Output:
2

Ex Input:
Sentence: 'a parking bench on the sidewalk a rope is draped from it and in the distance are a bunch of parked cars'. How many words start with the letter 'i' in the sentence.

Ex Output:
3