while true do
 term.clear()
 term.setCursorPos(1, 1)
 print("Please Enter Password:")
 input = read("*")
 if input == "door" then
  print("Access Granted.")
  redstone.setOutput("right", true)
  sleep(2)
  redstone.setOutput("right", false)
  end
  if input == "shell" then
  shell.exit()
  end
end