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

Ex Input:
Sentence: 'a man in mid swing of a baseball bat'. How many words contain the letter 'k' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a clock in the middle of a building'. How many words contain the letter 'x' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'an arrangement of several beds inside a  tepee'. How many words contain the letter 'n' in the sentence.

Ex Output:

3