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

Example Input: Sentence: 'unusual round vase with flower stems inside it'. How many words contain the letter 'c' in the sentence.
Example Output: 0

Example Input: Sentence: 'a child on the sand and a boat and some water'. How many words contain the letter 's' in the sentence.
Example Output: 2

Example Input: Sentence: 'this baseball player is preparing for a swing'. How many words contain the letter 'b' in the sentence.
Example Output:
1