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

Ex Input:
Sentence: 'a man and a woman sitting in the backseat as the woman talks on a cell phone'. How many words contain the letter 's' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a small plain kitchen with a white stove and microwave'. How many words contain the letter 'h' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a road with two cars a street sign and a stop sign'. How many words contain the letter 'f' in the sentence.

Ex Output:

0