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: ocean 
Words: current, data sets, main, sea, wave

Ex Output:
data sets


Ex Input:
Category: weather 
Words: impartial, 70, warm, fair, luke

Ex Output:
impartial


Ex Input:
Category: military rank 
Words: ubiquitous, soldier, general, colonel, sargent

Ex Output:

ubiquitous