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

Input: Consider Input: Sentence: 'a little boy learning to throw a frisbee'. How many words contain the letter 'h' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a zebra standing still in the grass near a tree'. How many words contain the letter 'w' in the sentence.

Output: 0

Input: Consider Input: Sentence: 'a couple of ladies that have some doughnuts'. How many words contain the letter 'd' in the sentence.
Output: 2