local modem = peripheral.wrap("back")
modem.open(10)
modem.open(100)


while true do
  sleep(0)
  local ModemEvent, ModemSide, ModemFrequency, ModemReplyFrequency, ModemMessage, ModemDistance = os.pullEvent("modem_message")
  m.transmit(ModemReplyFrequency, ModemFrequency, ModemMessage)
end