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

Example Input: Sentence: 'a person in the air on skis on a mountain slope'. How many words contain the letter 'w' in the sentence.
Example Output: 0

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: 'three houseboats with three people standing on one of them'. How many words contain the letter 'j' in the sentence.
Example Output:
0