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: window material 
Words: panel, translucent fabric, spatula, metal, glass

Ex Output:
spatula


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

Ex Output:
swallow


Ex Input:
Category: chocolate food 
Words: chocolate, falsehood, fudge, pie, pudding

Ex Output:

falsehood