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 person on a court with a tennis racket'. How many words start with the letter 'p' in the sentence.
Example Output: 1

Example Input: Sentence: 'an old fashioned table lamp on a bed side table in a hotel'. How many words start with the letter 'o' in the sentence.
Example Output: 2

Example Input: Sentence: 'an ornate black iron fence features a street sign'. How many words start with the letter 's' in the sentence.
Example Output:
2