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: errands, fax, file, type, ram

Ex Output:
ram


Ex Input:
Category: animal 
Words: dangle, fly, run, car, pounce

Ex Output:
car


Ex Input:
Category: geographical property 
Words: round, lined, valley, plane, flat

Ex Output:

round