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

Example Input: Sentence: 'a clothing line with teddy bears hung by their ears'. How many words contain the letter 'n' in the sentence.
Example Output: 3

Example Input: Sentence: 'skate boarder trying to maintain his balance during stunt'. How many words contain the letter 'w' in the sentence.
Example Output: 0

Example Input: Sentence: 'a kid with a bat in their hand swinging at a ball on top of a red and white fire hydrant'. How many words contain the letter 'x' in the sentence.
Example Output:
0