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

Input: Consider Input: Sentence: 'a dog on a deck ripping in to a plastic frisbee'. How many words contain the letter 'l' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'some brown and white goats and a man on some grass'. How many words contain the letter 'o' in the sentence.

Output: 5

Input: Consider Input: Sentence: 'a man surfing a big wave in the ocean'. How many words contain the letter 'n' in the sentence.
Output: 4