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

Example Input: Sentence: 'a white cat looking in a rectangular mirror in a female bedroom'. How many words contain the letter 'q' in the sentence.
Example Output: 0

Example Input: Sentence: 'cows crowd up to a barbed wire fence under a tree'. How many words contain the letter 'n' in the sentence.
Example Output: 2

Example Input: Sentence: 'a man holding a box while a person wearing a red jacket hands them an umbrella'. How many words contain the letter 'r' in the sentence.
Example Output:
4