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

Input: Consider Input: Sentence: 'several people sitting around a table eating pizza'. How many words contain the letter 'u' in the sentence.

Output: 1

Input: Consider Input: Sentence: 'a business man is talking on the phone'. How many words contain the letter 'e' in the sentence.

Output: 3

Input: Consider Input: Sentence: 'a person is walking down a path holding a bag and some kites'. How many words contain the letter 'w' in the sentence.
Output: 2