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: 'the large horse is getting his hooves shaped'. How many words start with the letter 'h' in the sentence.
Example Output: 3

Example Input: Sentence: 'a passenger train that is passing under some blue bars'. How many words start with the letter 'u' in the sentence.
Example Output: 1

Example Input: Sentence: 'two men sitting across from one another with a table in between'. How many words start with the letter 'a' in the sentence.
Example Output:
3