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 little boy sitting at a table with a spoon full of food'. How many words start with the letter 's' in the sentence.
Example Output: 2

Example Input: Sentence: 'a large group of men with bats in a dugout'. How many words start with the letter 'g' in the sentence.
Example Output: 1

Example Input: Sentence: 'a boat in a canal and a peddled bike taxi cart in snow with residences'. How many words start with the letter 'a' in the sentence.
Example Output:
4