local C = 0
local class_registry = {}
local function class()
  C = C + 1
  class_registry[C] = {}
  return C
end
local link = function(a,c,v,b)
  if not a[c] then a[c] = {} end
  if not b[-c] then b[-c] = {} end
  a[c][b] = v
  b[-c][a] = v
end
local classes = {}
for character in ("abcdefghijklmnopqrstuvwxyz "):gmatch(".") do
  classes[character] = class()
end
classes.next = class()
classes.inp = class()
classes.out = class()
local function l(a,c,v,b)
  
end
local function r(it)
  for class,link in pairs(it) do
    for to,value in pairs(link) do
      r(to)
      if class > 0 then
        l(it,class,value,to)
      else
        l(to,-class,value,it)
      end
    end
  end
end
while true do
  local input = io.read()
  local command,param = input:match("([^%s]+)(.*)")
  local function say(author,text)
    local previous
    for character in text:gmatch(".") do
      if classes[character] then
        local it = {}
        if previous then
          link(previous,classes.next,I,it)
        end
        link(it,classes.inp,I,{})
        link(it,classes[character],I,{})
        previous = it
        r(it)
      end
    end
  end
  (({
    ["inp"] = function(text)
      say(classes.inp,text)
    end,
    ["out"] = function(text)
      say(classes.out,text)
    end,
    ["exit"] = function()
      os.exit()
    end
  })[command] or function(param) print("Unexpected command: '"..command.."' for '"..param.."''") end)(param)
end