Given the task definition, example input & output, solve the new input case.
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.
Example: excavator, crane, pelican, hoist, upraise
Output: pelican
The common category here are words related to construction. A pelican is not related to construction because it is a type of bird.

New input case for you: current, flow, signal, dastards, sea
Output:
dastards