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

Example Input: Sentence: 'the view from the top of a ski slope'. How many words contain the letter 'r' in the sentence.
Example Output: 1

Example Input: Sentence: 'a couple of zebras are standing in a pin'. How many words contain the letter 'a' in the sentence.
Example Output: 5

Example Input: Sentence: 'two girls sitting inside a house while eating donuts'. How many words contain the letter 'v' in the sentence.
Example Output:
0