Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Input: Consider Input: Category: accomodation 
Words: apartment, cabin, squashed, smooth, flat

Output: smooth


Input: Consider Input: Category: employment activity 
Words: sack, inferno, promote, empower, fire

Output: inferno


Input: Consider Input: Category: mode of transportation 
Words: walk, swim, flutter, fly, drive


Output: walk