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

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 boy tucks his knees to complete a jump on his skate board'. How many words contain the letter 'f' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a table that has a chair and a sewing machine on it'. How many words contain the letter 'r' in the sentence.

Ex Output:

1