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: secretary duty 
Words: fax, program, file, make coffee, answer

Ex Output:
program


Ex Input:
Category: corporate 
Words: corporation, firm, synergy, tough, concerted

Ex Output:
tough


Ex Input:
Category: construction 
Words: concrete pourer, dump truck, egret, crane, winch

Ex Output:

egret