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

Ex Input:
Sentence: 'a man riding a snowboard down the side of a snow covered slope'. How many words contain the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'two elephants in the water in front of a waterfall'. How many words contain the letter 'x' in the sentence.

Ex Output:
0


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