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

Example Input: Sentence: 'a plate has many different types of food on it'. How many words contain the letter 'r' in the sentence.
Example Output: 1

Example Input: Sentence: 'a small plain kitchen with a white stove and microwave'. How many words contain the letter 'h' in the sentence.
Example Output: 3

Example Input: Sentence: 'the back of a stop sign on a city street'. How many words contain the letter 's' in the sentence.
Example Output:
3