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 kitchen that is very nice and clean'. How many words contain the letter 't' in the sentence.
Example Output: 2

Example Input: Sentence: 'a bunch of planes all flying in different directions'. How many words contain the letter 'r' in the sentence.
Example Output:
2