naming.rb

#!/usr/bin/env ruby

require 'readline'

class Naming
  def initialize(argv)
    @strs1 = ['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z']
    @strs2 = ['E','F','H','I','K','L','M','N','T','V','W','X','Y','Z']
    @strs3 = ['C','D','E','F','H','L','M','N','O','X','Z']
    @strs4 = [ 'Y','H','B','U','J','N','I','K','M','O','L','P']
    @strs5 = [ 'M','I','L','K','T','E','A']

    @num = 0 < argv.to_i ? argv.to_i : 4
  end

  def run
    make
    while buf = Readline.readline("press enter key if you retry naming. (exit to CTRL-C) ", true)
      make
    end
  end

  def make
    str = ""
    @num.times do
      str += @strs3.choice
    end
    p str.downcase
  end

end

class Array
  def choice
    at( rand( size ) )
  end
end

Naming.new(ARGV[0]).run