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

Ex Input:
Sentence: 'a person that is fixing a pillow on a couch'. How many words contain the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a couple of people that are on some skateboards'. How many words contain the letter 'o' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'a train is comign down the trakc with people in the last wagon'. How many words contain the letter 'e' in the sentence.

Ex Output:

3