#!/usr/bin/lua
local block = 16
while true do
  local bytes = io.read(block)
  if not bytes then break end
  for b in string.gfind(bytes, ".") do
        io.write(string.format("%02X ", string.byte(b)))
  end
  io.write(string.rep("   ", block - string.len(bytes) + 1))
  io.write(string.gsub(bytes, "%c", "."), "\n")
end