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 room filled with a stove and surrounded by cabinets'. How many words start with the letter 'w' in the sentence.
Example Output: 1

Example Input: Sentence: 'this photo shows four copies of the same fire hydrant'. How many words start with the letter 't' in the sentence.
Example Output: 2

Example Input: Sentence: 'a water surfer is in the middle of a wave'. How many words start with the letter 't' in the sentence.
Example Output:
1