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

Input: Consider Input: Sentence: 'an old motorcycle with the seat missing parked in a garage with other parts and motorcycles'. How many words contain the letter 'r' in the sentence.

Output: 6


Input: Consider Input: Sentence: 'a person in a helmet riding a skateboard'. How many words contain the letter 'c' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a hot dog on a bun sitting on top of a plate'. How many words contain the letter 'u' in the sentence.


Output: 1