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.

Input: Consider Input: Category: boxing terminology 
Words: pack, level, deck, corner, jab

Output: pack


Input: Consider Input: Category: construction 
Words: excavator, steam roller, concrete pourer, swallow, crane

Output: swallow


Input: Consider Input: Category: employment activity 
Words: promote, ice, retire, ban, fire


Output: ice