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: military rank 
Words: regular, major, general, soldier, cadet

Ex Output:
regular


Ex Input:
Category: type of sandwich 
Words: lettuce, hamburger, place, open-faced, club

Ex Output:

place