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

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 vase picture and a bird statue on a table'. How many words contain the letter 'j' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a cat lying inside a mesh pocket of an open suitcase'. How many words contain the letter 'a' in the sentence.

Ex Output:

5