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

Example Input: Sentence: 'two giraffe a mom and baby both with their heads up'. How many words contain the letter 'w' in the sentence.
Example Output: 2

Example Input: Sentence: 'a biscuit that someone has taken a bite out of'. How many words contain the letter 'k' in the sentence.
Example Output: 1

Example Input: Sentence: 'a man doing a skateboard jump over a red structure'. How many words contain the letter 'i' in the sentence.
Example Output:
1