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: convention, club, discothek, hamburger, dance hall

Ex Output:
hamburger


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

Ex Output:
software


Ex Input:
Category: employment activity 
Words: retire, heat, fire, instruct, recruit

Ex Output:

heat