switch(in.sval)
            {
                case "register":
                    {
                        in.nextToken(); log=in.sval; if(log==null) log=Integer.toString((int)in.nval);
                        in.nextToken(); pas=in.sval; if(pas==null) pas=Integer.toString((int)in.nval);
                        if(m.containsKey(log)) out.println("fail: user already exists");
                        else
                        {
                            m.put(log,pas);
                            out.println("success: new user added");
                        }
                    }
                    break;
                case "login":
                    {
                        in.nextToken(); log=in.sval; if(log==null) log=Integer.toString((int)in.nval);
                        in.nextToken(); pas=in.sval; if(pas==null) pas=Integer.toString((int)in.nval);
                        if(!m.containsKey(log)) out.println("fail: no such user");
                        else if(!m.get(log).equals(pas)) out.println("fail: incorrect password");
                        else if(a.contains(log)) out.println("fail: already logged in");
                        else
                        {
                            a.add(log); //out.println(m.get(log) + " " + pas);
                            out.println("success: user logged in");
                        }
                    }
                    break;
                case "logout":
                    {
                        in.nextToken(); log=in.sval; if(log==null) log=Integer.toString((int)in.nval);
                        if(!m.containsKey(log)) out.println("fail: no such user");
                        else if(!a.contains(log)) out.println("fail: already logged out");
                        else
                        {
                            a.remove(log);
                            out.println("success: user logged out");
                        }
                    }
                    break;

            }