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

Ex Input:
Sentence: 'a very big nice looking kitchen that is well lit'. How many words contain the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a small terrier stands in the open suitcase ready to go'. How many words contain the letter 'l' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'the special 2 city bus shown parked along the street'. How many words contain the letter 's' in the sentence.

Ex Output:

4