#include <iostream>
#include <iomanip>
#include <conio.h>
#include <cstdlib>

using namespace std;

class Snake_Int
{
    public:
    int x=0, y=0;
    void Moves(int a, int b);
    char Key;


}Snake;
void Snake_Int::Moves(int a, int b)
{


    system("CLS");

    for (int i = 0; i < b; ++i)
        cout << "\n";

    cout << setw(a);
    cout << "0" ;

}

int main()
{
    Snake_Int Snake;

    i:
    Snake.Key = getch();

    switch(Snake.Key)
    {
        case 's':
        {
            Snake.Moves(Snake.x,++Snake.y);
            break;
        }
        case 'w':
        {
            Snake.Moves(Snake.x,--Snake.y);
            break;
        }
        case 'a':
        {
            Snake.Moves(--Snake.x,Snake.y);
            break;
        }
        case 'd':
        {
            Snake.Moves(++Snake.x,Snake.y);
            break;
        }
    }
    goto i;
    return 0;
}