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: elements 
Words: ground, replace, combustion, flame, fire

Ex Output:
replace


Ex Input:
Category: consumer product 
Words: content, panicked, file, substance, jewelry

Ex Output:
panicked


Ex Input:
Category: outdoor sport activity 
Words: fish, hiking, row, shark, canoe

Ex Output:

shark