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

Example Input: Sentence: 'a baseball player in the middle of a swing'. How many words contain the letter 'p' in the sentence.
Example Output: 1

Example Input: Sentence: 'two men are dancing in a parade with brown umbrellas'. How many words contain the letter 'r' in the sentence.
Example Output: 4

Example Input: Sentence: 'a person talking to two policemen on horses in a park'. How many words contain the letter 'a' in the sentence.
Example Output:
4