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 picture of a plane in the air'. How many words contain the letter 'l' in the sentence.
Example Output: 1

Example Input: Sentence: 'a yellow sign pointing to a dead end'. How many words contain the letter 'z' in the sentence.
Example Output:
0