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

Example Input: Sentence: 'a man with a skateboard up in air at a skateboard park'. How many words contain the letter 's' in the sentence.
Example Output: 2

Example Input: Sentence: 'a boy is doing a trick with his skateboard'. How many words contain the letter 'y' in the sentence.
Example Output: 1

Example Input: Sentence: 'picture of bottom of jacket with stethescope poking out from underneath'. How many words contain the letter 's' in the sentence.
Example Output:
1