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

Ex Input:
Sentence: 'a motorcycle parked in front of a small cafe'. How many words contain the letter 'n' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'martha stewart holding a fluffy siamese cat on her arms'. How many words contain the letter 'a' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'a small kid standing on a dirt road'. How many words contain the letter 'z' in the sentence.

Ex Output:

0