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: 'two men holding electronic devices compete in an interactive game'. How many words start with the letter 't' in the sentence.
Example Output: 1

Example Input: Sentence: 'a group of parked bikes sitting on the side of a road'. How many words start with the letter 'o' in the sentence.
Example Output: 3

Example Input: Sentence: 'a street sign view in a very blurry picture'. How many words start with the letter 's' in the sentence.
Example Output:
2