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 living area with a couch coffee table and bookshelf'. How many words start with the letter 'l' in the sentence.
Example Output: 1

Example Input: Sentence: 'a man holding a baby two women and two cakes'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a yellow toy car with lights on sitting on a black mat'. How many words start with the letter 'a' in the sentence.
Example Output:
2