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

Example Input: Sentence: 'a cellphone mounted to a dashboard of a car'. How many words contain the letter 'p' in the sentence.
Example Output: 1

Example Input: Sentence: 'there are trains that are on the train track'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'three people entering or leaving a car that is on the side of the road next to a bus'. How many words contain the letter 's' in the sentence.
Example Output:
3