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

Example Input: Sentence: 'a person that is fixing a pillow on a couch'. How many words contain the letter 's' in the sentence.
Example Output: 2

Example Input: Sentence: 'a gray cat is wearing a santa hat'. How many words contain the letter 'm' in the sentence.
Example Output: 0

Example Input: Sentence: 'a couple of animals play in a watering hole'. How many words contain the letter 'f' in the sentence.
Example Output:
1