Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Ex Input:
trap, kayak, bat, climbing, fish

Ex Output:
bat


Ex Input:
spatula, panel, plastic, glass, translucent fabric

Ex Output:
spatula


Ex Input:
admiral, popular, fighter, general, lieutenant

Ex Output:

popular