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

Ex Input:
Sentence: 'a large clock mounted in the face of a building'. How many words contain the letter 'e' in the sentence.

Ex Output:
4

Ex Input:
Sentence: 'a cat is laying in a piece of luggage'. How many words contain the letter 'p' in the sentence.

Ex Output:
1

Ex Input:
Sentence: 'a cat sits on the seat of a bicycle and looks down at another cat on a snowy day'. How many words contain the letter 'b' in the sentence.

Ex Output:
1