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

Ex Input:
Sentence: 'a stop light that is out on a pole'. How many words contain the letter 'z' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a large red sign on a metal pole'. How many words contain the letter 'q' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a black and white picture of a street with stores on it and street signs'. How many words contain the letter 'n' in the sentence.

Ex Output:

4