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

Ex Input:
Sentence: 'ancient pottery being displayed on an exhibit case'. How many words contain the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man that is sitting on a horse in the grass'. How many words contain the letter 'y' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'closeup of an image of a toaster and a noadmittance sign'. How many words contain the letter 'k' in the sentence.

Ex Output:

0