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

Example Input: Sentence: 'a woman riding a motorcycle down a busy city street'. How many words contain the letter 'w' in the sentence.
Example Output: 2

Example Input: Sentence: 'a cellphone mounted to a dashboard of a car'. How many words contain the letter 'p' in the sentence.
Example Output: 1

Example Input: Sentence: 'fighter jets leaving behind patriotic colored vapor trails'. How many words contain the letter 'r' in the sentence.
Example Output:
5