#define     BUTTON          SENSOR_2

void trackRight()
	{
	int x=SENSOR_1, y=SENSOR_3;
	
	Fwd(OUT_A + OUT_C);
	while(x<50&&y>45&&y<55)
		{
		SetUserDisplay(x,0);
		x=SENSOR_1;
		y=SENSOR_3;
		SetPower(OUT_A + OUT_C, 7);
		SetOutput(OUT_A + OUT_C, OUT_ON);
		}
	SetUserDisplay(x,0);
	SetOutput(OUT_A + OUT_C, OUT_OFF);
	
	SetPower(OUT_A + OUT_C, 3);
	Rev(OUT_C);
	OnFor(OUT_A + OUT_C, 30);
	Toggle(OUT_A + OUT_C);
	x=SENSOR_1;
	y=SENSOR_3;
	while (x>=50||y<45)
		{
		SetOutput(OUT_A + OUT_C, OUT_ON);
		x=SENSOR_1;
		y=SENSOR_3;
		SetUserDisplay(x,0);
		}
	SetOutput(OUT_A + OUT_C, OUT_OFF);
	Fwd(OUT_A + OUT_C);	

	}

task main()

{
	SetSensor(BUTTON,SENSOR_TOUCH);
	SetSensor(SENSOR_1,SENSOR_LIGHT);
	SetSensor(SENSOR_3,SENSOR_LIGHT);

	int left=SENSOR_1;

	/* Wait for the start */
	until (BUTTON == 1)
	;
  
	PlaySound (SOUND_CLICK);
	while(left<55)
		trackRight();  



} /* main */