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

Ex Input:
Sentence: 'a person in the air with a skateboard upside down underneath'. How many words contain the letter 'i' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a plate with a grilled sanwich next to a bowl of tomato soup'. How many words contain the letter 'a' in the sentence.

Ex Output:
6


Ex Input:
Sentence: 'a bunch of horses walk down a road'. How many words contain the letter 'i' in the sentence.

Ex Output:

0