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

Example Input: Sentence: 'a couple of people that are on some skateboards'. How many words contain the letter 'o' in the sentence.
Example Output: 6

Example Input: Sentence: 'looking out a window at a tall building with a clock on the face'. How many words contain the letter 'l' in the sentence.
Example Output: 4

Example Input: Sentence: 'its a very fancy bathroom that has a fountain and pictures over the urinals'. How many words contain the letter 'n' in the sentence.
Example Output:
4