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

Example Input: Sentence: 'a couple sitting on seats on a train'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'a green and white street sign on a pole and a light'. How many words contain the letter 's' in the sentence.
Example Output: 2

Example Input: Sentence: 'two men play wii together while a baby watches'. How many words contain the letter 'q' in the sentence.
Example Output:
0