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

Example Input: Sentence: 'a airplane that has a propeller on the wing'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'a dog jumping up and catching a frisbee in its mouth'. How many words contain the letter 'r' in the sentence.
Example Output: 1

Example Input: Sentence: 'a photo taken of a bridge with a clock tower in the background'. How many words contain the letter 'o' in the sentence.
Example Output:
5