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

Ex Input:
Sentence: 'a cat sitting on the arm of a chair'. How many words contain the letter 'g' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man that is sitting on a horse in the grass'. How many words contain the letter 'y' in the sentence.

Ex Output:
0


Ex Input:
Sentence: 'a street sign that is covered in stickers on the back'. How many words contain the letter 'i' in the sentence.

Ex Output:

4