term.clear()
    term.setCursorPos(1, 2)

    levels = {0, 15, 18}

    print ("+------------------------------------------------+")
    print ("|                                                |")
    print ("|       -- Elevator Control Terminal --          |")
    print ("|                                                |")
    print ("|                                                |")
    print ("|      From Level: [               ]             |")
    print ("|      To Level:   [               ]             |")
    print ("|                                                |")
    print ("|------------------------------------------------|")
    print ("|                                   Version 0.1  |")
    print ("+------------------------------------------------+")

    term.setCursorPos(21, 7)
    from = tonumber(read())
    term.setCursorPos(21, 8)
    to = tonumber(read())

    diff = levels[to] - levels[from]

    if (diff == 0) then
    else
        if (diff < 0) then
            diff = -1 * diff
            for i = 1, diff do
                rednet.broadcast("DOWN");
            end
        else
            for i = 1, diff do
                rednet.broadcast("UP");
            end
        end
    end