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: '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: 'a clock tower in front of a dark sky'. How many words start with the letter 'f' in the sentence.
Example Output: 1

Example Input: Sentence: 'a tall clock tower with a building behind it and long pools of water with fountains in front of it'. How many words start with the letter 'w' in the sentence.
Example Output:
3