class Buffer
  new: (limit = 5) =>
    @limit = limit
    @data = {}

  add: (line) =>
    if #data == @limit
      table.remove @data, 0

    table.insert @data, line

b = Buffer!
while true
  n = io.read!
  if n ~= nil
    b\add(n)
  else break

for _, i in pairs b\data
  print i