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

Input: Consider Input: Sentence: 'people holding a surfboard and walking down the beach'. How many words contain the letter 'n' in the sentence.

Output: 4

Input: Consider Input: Sentence: 'a pair of tennis players on a tennis court'. How many words contain the letter 'u' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'two men on horseback and a man with carrots feeding the horses'. How many words contain the letter 'u' in the sentence.
Output: 0