io.output(south)

local rooms = {}
rooms[1] = {
  south=3,
  east=2
}
rooms[2] = {
  south=4,
  west=1
}
rooms[3] = {
  north=1,
  east=4
}
currentRoom = 1
repeat
  local move = io.read("*all")
  local room = rooms[currentRoom][move]
  if room == nil then
    room = currentRoom
    print("Invalid move")
  elseif room == 4 then
    print("Congratulations, you won!")
  end
  currentRoom = room or currentRoom
until currentRoom == 4