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: 'three chefs talking to each other at a bar'. How many words start with the letter 't' in the sentence.
Example Output: 3

Example Input: Sentence: 'a boy standing on sand and flying a green kite'. How many words start with the letter 'f' in the sentence.
Example Output: 1

Example Input: Sentence: 'a toilet that has been converted into a plant holder in the garden'. How many words start with the letter 't' in the sentence.
Example Output:
3