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

Example Input: Sentence: 'a man riding a snowboard down the side of a snow covered slope'. How many words contain the letter 'c' in the sentence.
Example Output: 1

Example Input: Sentence: 'a girl at a lake is looking at sand inside of a frisbee'. How many words contain the letter 'u' in the sentence.
Example Output: 0

Example Input: Sentence: 'a tennis player is in mid swing about to strike'. How many words contain the letter 'i' in the sentence.
Example Output:
6