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 silver television a black couch a table and some ceiling fans'. How many words contain the letter 's' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a dog in a doorway above bunches of unripe bananas'. How many words contain the letter 'y' in the sentence.

Ex Output:

1