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

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 modern looking bathroom has a toilet and a sink'. How many words contain the letter 'o' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a man on a baseball field swinging a bat'. How many words contain the letter 's' in the sentence.

Ex Output:

2