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

Ex Input:
Sentence: 'a couple of zebras are standing in a pin'. How many words contain the letter 'a' in the sentence.

Ex Output:
5

Ex Input:
Sentence: 'a piece of half eaten swirl cheesecake on a plate'. How many words contain the letter 'j' in the sentence.

Ex Output:
0

Ex Input:
Sentence: 'a very large zebra that is standing in a field'. How many words contain the letter 'x' in the sentence.

Ex Output:
0