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

Example Input: Sentence: 'a man and a woman stand under an umbrella'. How many words contain the letter 's' 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 kitten peeking around the leg of a chair'. How many words contain the letter 'r' in the sentence.
Example Output:
2