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

Example Input: Sentence: 'an airplane in the sky trailing condensation'. How many words contain the letter 'p' in the sentence.
Example Output: 1

Example Input: Sentence: 'a boy is doing a trick with his skateboard'. How many words contain the letter 'y' in the sentence.
Example Output: 1

Example Input: Sentence: 'a older woman sitting on the ground while brushing her hair'. How many words contain the letter 'r' in the sentence.
Example Output:
5