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 person that is wearing glasses looking into a mirror'. How many words contain the letter 'f' in the sentence.
Example Output: 0

Example Input: Sentence: 'cow in at bazaar standing under some dress'. How many words contain the letter 'z' in the sentence.
Example Output:
1