C#编写抽奖问题

输入每个人的中奖号码，进行滚动显示    //清屏  //随即一个索引   // 根据索引打印  //等待0.1秒
            Console.Write("请输入参与者人数：");
            int s = int.Parse(Console.ReadLine());
            string[] ss = new string[s];
            for (int i = 0; i < s; i++)
            {
                Console.WriteLine("输入第" + (i + 1) + "个人的号码");
                ss[i] = Console.ReadLine();
            }
            Console.WriteLine("所有号码输入完毕！请按回车键");
            Console.ReadLine();
            Random a = new Random();
            for (int i = 0; i < 30; i++)
            {
                Console.Clear();
                int aa = a.Next(s);
                Console.Write("中奖号码是：" + ss[aa]);
                System.Threading.Thread.Sleep(100);
            }
            Console.ReadLine();