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

Example Input: Sentence: 'a close up of two people wearing ties'. How many words contain the letter 'o' in the sentence.
Example Output: 4

Example Input: Sentence: 'people holding a surfboard and walking down the beach'. How many words contain the letter 'n' in the sentence.
Example Output: 4

Example Input: Sentence: 'a family standing on a beach looking over the water while one sets up a large umbrella'. How many words contain the letter 'r' in the sentence.
Example Output:
4