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: mode of transportation 
Words: spider, fly, drive, train, soar

Ex Output:
spider


Ex Input:
Category: consumer product 
Words: content, books, thing, program, jealous

Ex Output:
jealous


Ex Input:
Category: social gathering 
Words: clan, hamburger, discothek, outing, club

Ex Output:

hamburger