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 with a toilet with a blue seat'. How many words start with the letter 'b' in the sentence.
Example Output: 2

Example Input: Sentence: 'bed with white blanket and two pillows with a light glowing from under and behind the bed'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a flat screen tv with an image of a baseball player holding a baseball bat'. How many words start with the letter 'a' in the sentence.
Example Output:
4