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

Example Input: Sentence: 'a rack full of clothes in a small bedroom'. How many words contain the letter 'o' in the sentence.
Example Output: 3

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 street vendor with lots of produce and green bananas at his feet'. How many words contain the letter 'n' in the sentence.
Example Output:
4