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: social gathering 
Words: club, bar, dance hall, discothek, roll

Ex Output:
roll


Ex Input:
Category: construction 
Words: tackle, crane, digger, sandpiper, dump truck

Ex Output:
sandpiper


Ex Input:
Category: bird 
Words: egret, crane, goose, dump truck, duck

Ex Output:

dump truck