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

Input: Consider Input: Sentence: 'a black and white photo of a very crowded tropical beach'. How many words contain the letter 'p' in the sentence.

Output: 2


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: 'this is a yellow train riding the rails'. How many words contain the letter 'n' in the sentence.


Output: 2