点睛评 Fire, water, and money are good servants, but bad masters.

killl

帖子：http://www.readfree.net/bbs/read.php?tid=4596140
《破解大傻鱼的存款密码》（答案请加密，有推理步骤者10分）

点睛评：Fire, water, and money are good servants, but bad masters.

  Never be the servant of money, even if you are the coolest man here --coolman! So let's help him to take care of his burdens. Now you only need to decode the mysterious 4 digits and you can get 10 gold coins. Of course, don't let others get this news. So you need to ENCRYPT your solution and provide the detailed procedure. Be careful. After all, walls have ears!