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 in the air on skis on a mountain slope'. How many words contain the letter 'w' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a clock in the middle of a building'. How many words contain the letter 'x' in the sentence.

Output: 0


Input: Consider Input: Sentence: 'a den with a couch chairs coffee table and various decorations'. How many words contain the letter 'n' in the sentence.


Output: 3