int x = 0;
int y = 0;
void setup()
{
  
size(500,500);  
}

void draw()
{
 
}

void keyPressed() 
{
  
background(122,122,122);
fill(int(random(255)),int(random(255)),int(random(255)));

if (keyCode == UP) y-=10;
if (keyCode == DOWN) y+=10;
if (keyCode == LEFT) x-=10;
if (keyCode == RIGHT) x+=10;
rect(x,y,50,50); 

}