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 boy wearing blue has a skateboard in the air near a black railing'. How many words start with the letter 'a' in the sentence.
Example Output: 4

Example Input: Sentence: 'a man in an apron working in front of a fireplace'. How many words start with the letter 'a' in the sentence.
Example Output: 4

Example Input: Sentence: 'split photos of man in tuxedo displaying different flowers pinned to lapel'. How many words start with the letter 't' in the sentence.
Example Output:
2