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: construction 
Words: digger, concrete pourer, crane, derrick, excavator

Output: derrick


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

Output: ice


Input: Consider Input: Category: emotional display 
Words: woo, cajole, fawn, lust, doe


Output: doe