In this task, you need to count the number of words in a sentence that contain the given letter

Example Input: Sentence: 'a man on a motorcycle towing another man on a skateboard'. How many words contain the letter 'n' in the sentence.
Example Output: 6

Example Input: Sentence: 'a man paddle boarding in the middle of the ocean'. How many words contain the letter 'i' in the sentence.
Example Output: 3

Example Input: Sentence: 'a boat that is out in the middle of the ocean'. How many words contain the letter 'b' in the sentence.
Example Output:
1