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

Example Input: Sentence: 'there is a red tea pot that has flowers in it'. How many words contain the letter 'o' in the sentence.
Example Output: 2

Example Input: Sentence: 'a man in mid swing of a baseball bat'. How many words contain the letter 'k' in the sentence.
Example Output: 0

Example Input: Sentence: 'some people sitting at a table eating in a restaurant'. How many words contain the letter 'n' in the sentence.
Example Output:
4