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 photo of a waterway with several boats along the shore'. How many words start with the letter 'w' in the sentence.
Example Output: 2

Example Input: Sentence: 'car pass threw a green light in the day light'. How many words start with the letter 'd' in the sentence.
Example Output: 1

Example Input: Sentence: 'a open fridge that has different items inside of it'. How many words start with the letter 'i' in the sentence.
Example Output:
3