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.

Ex Input:
Category: geographical property 
Words: horizontal, hotel, flat, lined, smooth

Ex Output:
hotel


Ex Input:
Category: ocean 
Words: current, data sets, main, sea, wave

Ex Output:
data sets


Ex Input:
Category: geographical property 
Words: smooth, flat, hill, plain, mansion

Ex Output:

mansion


