#include<stdio.h>
#include<conio.h>

int main()
{
 struct point
 {
 int x,y;
 int xv,yv;
 }man;
 long p;
 man.x=man.y=20;
 man.xv=man.yv=1;
 clrscr();
 p=100000000;
 while(p--)
 {
 if(p%50000) continue;
 gotoxy(man.x,man.y);
 printf(" ");
 man.x+=man.xv;
 if(man.x<10) { man.x=10; man.xv*=-1; }
 else if(man.x>70) { man.x=70; man.xv*=-1; }
 man.y+=man.yv;
 if(man.y<10) { man.y=10; man.yv*=-1; }
 else if(man.y>70) { man.y=70; man.yv*=-1; }
 gotoxy(man.x, man.y);
 printf("%c\b",2);
 }
 getch();
 return 0;
}