Definition: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Input: Which is not a last name, Zuse or Relay?, Context: Early digital computers were electromechanical; electric switches drove mechanical relays to perform the calculation. These devices had a low operating speed and were eventually superseded by much faster all-electric computers, originally using vacuum tubes. The Z2, created by German engineer Konrad Zuse in 1939, was one of the earliest examples of an electromechanical relay computer.
Output:
relay