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: bird 
Words: neck, tackle, derrick, crane, steam roller

Ex Output:
steam roller


Ex Input:
Category: computers 
Words: hardware, sort mail, download, program, file

Ex Output:
sort mail


Ex Input:
Category: bird 
Words: crane, concrete pourer, parrot, davit, sandpiper

Ex Output:

concrete pourer