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

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 construction worker smashes away at the roof of a building'. How many words contain the letter 'b' in the sentence.
Example Output: 1

Example Input: Sentence: 'a close up of a in a paper box'. How many words contain the letter 'q' in the sentence.
Example Output:
0