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

Example Input: Sentence: 'a crowd of people walking around a city street'. How many words contain the letter 'p' in the sentence.
Example Output: 1

Example Input: Sentence: 'a beautiful old clock tower in a citys historic district'. How many words contain the letter 'a' in the sentence.
Example Output: 3

Example Input: Sentence: 'a tennis player on a tennis court running and holding a racket'. How many words contain the letter 'c' in the sentence.
Example Output:
2