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: 'man playing tennis on dirt court outside in the sun'. How many words start with the letter 'd' in the sentence.
Example Output: 1

Example Input: Sentence: 'some unfinished looking wood is in a white bathroom'. How many words start with the letter 'w' in the sentence.
Example Output: 2

Example Input: Sentence: 'a glass plate that has food on it'. How many words start with the letter 'i' in the sentence.
Example Output:
1