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: construction 
Words: hoist, crane, excavator, egret, derrick

Ex Output:
egret


Ex Input:
Category: secretary duty 
Words: support, type, file, software, answer

Ex Output:
software


Ex Input:
Category: outdoor sport activity 
Words: kayak, wrestle, fish, stingray, canoe

Ex Output:

stingray