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

Example Input: Sentence: 'a surfer in a black wet suit riding a wave in the ocean'. How many words contain the letter 'x' in the sentence.
Example Output: 0

Example Input: Sentence: 'the young giraffe is standing near the fence'. How many words contain the letter 's' in the sentence.
Example Output: 2

Example Input: Sentence: 'a bathtub with legs on it positioned near a toilet'. How many words contain the letter 'n' in the sentence.
Example Output:
3