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

Example Input: Sentence: 'a white longheaired dog eating a birthday cake'. How many words contain the letter 'z' in the sentence.
Example Output: 0

Example Input: Sentence: 'people standing in a river surrounding an elephant some are touching it'. How many words contain the letter 'd' in the sentence.
Example Output: 2

Example Input: Sentence: 'a table with multiple boxes of cupcakes on top'. How many words contain the letter 'p' in the sentence.
Example Output:
3