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

Ex Input:
Sentence: 'a fresh flower on a table in a piture of water'. How many words contain the letter 'n' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'bus parked next to a side walk on the road'. How many words contain the letter 'd' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man who bashed his head into the back end of a tv hunched over on the ground'. How many words contain the letter 'v' in the sentence.

Ex Output:

2