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:
fish, bat, mice, dog, hiking

Ex Output:
hiking


Ex Input:
gated, right there, not open, barred, close

Ex Output:
right there


Ex Input:
schedule appointments, prepare, file, program, answer

Ex Output:

program