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

Input: Consider Input: Sentence: 'a young man attempting to fly a kite on a forest hillside'. How many words contain the letter 'f' in the sentence.

Output: 2


Input: Consider Input: Sentence: 'a silver television a black couch a table and some ceiling fans'. How many words contain the letter 's' in the sentence.

Output: 4


Input: Consider Input: Sentence: 'three birds perched on top of a wire fence'. How many words contain the letter 'b' in the sentence.


Output: 1