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 bedroom area with bed two dressers and a window'. How many words start with the letter 'w' in the sentence.
Example Output: 2

Example Input: Sentence: 'an airplane as it is taking off and is ascending into space'. How many words start with the letter 'a' in the sentence.
Example Output: 5

Example Input: Sentence: 'a kitten being roasted inside of a microwave oven'. How many words start with the letter 'm' in the sentence.
Example Output:
1