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

Example Input: Sentence: 'adults with helmets sitting on tricycles made for children'. How many words contain the letter 'r' in the sentence.
Example Output: 3

Example Input: Sentence: 'a hotdog is in a bun covered in cheese'. How many words contain the letter 'q' in the sentence.
Example Output: 0

Example Input: Sentence: 'a boat is docked as multiple people gather around'. How many words contain the letter 'a' in the sentence.
Example Output:
5