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

Ex Input:
Sentence: 'a lit street light next to a bar'. How many words contain the letter 'w' in the sentence.

Ex Output:
0

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: 'a little boy and girl sitting at a table eating some food'. How many words contain the letter 'a' in the sentence.

Ex Output:
6