using System;
using System.Collections.Generic;

namespace NewNamespace
{
    class Program
    {
        static void Main(string[] args)
        {
            ConsoleKeyInfo key;
            int x = 0, y = 0;
            do
            {
                Console.Clear();
                Console.SetCursorPosition(x, y);
                Console.WriteLine("@");
                key = Console.ReadKey();
                if (key.Key == ConsoleKey.LeftArrow) x--;
                if (key.Key == ConsoleKey.RightArrow)x++;
                if (key.Key == ConsoleKey.UpArrow)   y--;
                if (key.Key == ConsoleKey.DownArrow) y++;

                if (x < 0) x = 0;
                if (y < 0) y = 0;
            }
            while (key.Key != ConsoleKey.Escape);
        }
    }
}