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.

Example Input: Sentence: 'several friends are setting around a dinner table'. How many words start with the letter 's' in the sentence.
Example Output: 2

Example Input: Sentence: 'a man that has a tennis racket by a court'. How many words start with the letter 'h' in the sentence.
Example Output: 1

Example Input: Sentence: 'three people are playing in a blue pool'. How many words start with the letter 'a' in the sentence.
Example Output:
2