local bEnd = false;

print("Press <SPACE> to stop attacking.")

parallel.waitForAny(
function()
  while not bEnd do
   local event, key = os.pullEvent("key");
   if key ~= 1 then
        bEnd = true;
        print("Aborting...");
   end
  end
end,
function()
  while not bEnd do
   turtle.attack()
   turtle.suck()
   sleep(0.25)
   if turtle.getItemCount(16) > 0 then
    turtle.turnLeft()
        turtle.turnLeft()
        for i = 1,16 do
         turtle.select(i)
         if turtle.getItemCount(i) > 0 then
          turtle.drop()
         end
        end
        turtle.turnLeft()
        turtle.turnLeft()
   end
   turtle.select(1)
  end
end
)