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

Input: Consider Input: Sentence: 'a person that is flying a hamburger kite'. How many words contain the letter 'b' in the sentence.

Output: 1


Input: Consider Input: Sentence: 'a young pitcher throws a ball on the pitchers mound while a man in red shirt looks at him'. How many words contain the letter 'z' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'two boys sitting with stuffed animals and a sign with the number 20 crossed out'. How many words contain the letter 'v' in the sentence.


Output: 0