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: direction 
Words: south, loveful, down, left, falling

Ex Output:
loveful


Ex Input:
Category: secretary duty 
Words: correspondence, schedule, answer calls, keys, file

Ex Output:
keys


Ex Input:
Category: secretary duty 
Words: errands, type, file, program, prepare

Ex Output:

program