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

Input: Consider Input: Sentence: 'a zebra standing still in the grass near a tree'. How many words contain the letter 'w' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a dog lying down with a blanket on top of it'. How many words contain the letter 'o' in the sentence.

Output: 5


Input: Consider Input: Sentence: 'a male is wearing a white shirt and a tie and is sitting'. How many words contain the letter 's' in the sentence.


Output: 4