def print_input message, level=:debug
      return if LEVELS.index(level) > LEVELS.index(@@log_level)
      puts format_lhs("", "", "<") + message, :default
    end
def print_input message, level=:debug
      return if LEVELS.index(level) > LEVELS.index(@@log_level)
      puts format_lhs("", "", "<") + message, :default
    end
Print an IO input interaction