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: '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: 'two elephants with people riding on them next to block barriers'. How many words start with the letter 'o' 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