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 plate with potato pancakes and a fork'. How many words start with the letter 'p' in the sentence.
Example Output: 3

Example Input: Sentence: 'a baseball player prepares to swing at a pitch'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a couple of large windows sitting over a wooden bench'. How many words start with the letter 'w' in the sentence.
Example Output:
2