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 young man holding a tennis racquet and its case'. How many words start with the letter 'h' in the sentence.
Example Output: 1

Example Input: Sentence: 'a batter lifts his left foot as he swings the bat'. How many words start with the letter 'a' in the sentence.
Example Output: 2

Example Input: Sentence: 'a phone that is on a stand that is on a table'. How many words start with the letter 'a' in the sentence.
Example Output:
3