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

Example Input: Sentence: 'a man and a woman sitting in the backseat as the woman talks on a cell phone'. How many words contain the letter 's' in the sentence.
Example Output: 4

Example Input: Sentence: 'a living room filled with furniture and a large wooden shelf'. How many words contain the letter 'e' in the sentence.
Example Output: 5

Example Input: Sentence: 'two people sitting on a couch playing nintendo wii'. How many words contain the letter 'b' in the sentence.
Example Output:
0