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

Example Input: Sentence: 'the view from the top of a ski slope'. How many words contain the letter 'r' in the sentence.
Example Output: 1

Example Input: Sentence: 'a cat sitting on the arm of a chair'. How many words contain the letter 'g' in the sentence.
Example Output: 1

Example Input: Sentence: 'a woman holding a tennis racquet on a tennis court'. How many words contain the letter 'i' in the sentence.
Example Output:
3