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

Example Input: Sentence: 'a person in the air on skis on a mountain slope'. How many words contain the letter 'w' in the sentence.
Example Output: 0

Example Input: Sentence: 'a picture of a plane in the air'. How many words contain the letter 'l' in the sentence.
Example Output: 1

Example Input: Sentence: 'the game is being played on a baseball field located in a residential area'. How many words contain the letter 'i' in the sentence.
Example Output:
5