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: 'this kitchen has wooden cabinets and silver and black appliances'. How many words start with the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a picture of a zebra that is walking in the grass'. How many words start with the letter 'z' in the sentence.
Example Output: 1

Example Input: Sentence: 'a lady playing a game of tennis on a green and blue court'. How many words start with the letter 'l' in the sentence.
Example Output:
1

