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.

Example Input: Category: weather 
Words: even, tangle, mild, fair, 70
Example Output: even

Example Input: Category: bird 
Words: digger, heron, crane, mallet, sandpiper
Example Output: digger

Example Input: Category: construction 
Words: neck, upraise, crane, excavator, digger
Example Output:
neck