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 bathroom that has a toilet and window in it'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a dog on one side of a glass door and a cat on the other side'. How many words start with the letter 'a' in the sentence.
Example Output: 4

Example Input: Sentence: 'a group of men and women on a sports team'. How many words start with the letter 't' in the sentence.
Example Output:
1