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

Example Input: Sentence: 'a young man dressed like a pirate on a skateboard'. How many words contain the letter 'a' in the sentence.
Example Output: 6

Example Input: Sentence: 'a young person flying through the air while riding a skateboard'. How many words contain the letter 'd' in the sentence.
Example Output: 2

Example Input: Sentence: 'a little child is in a bathroom against the door'. How many words contain the letter 'i' in the sentence.
Example Output:
5