int pin;

void setup()
{
  for(pin=12;pin<=19;pin++)  
  {pinMode(pin, OUTPUT);  
  }
}

void loop() 
 {
  for(pin=12;pin<=19;pin++)  
  {
    digitalWrite(pin, HIGH);
    delay(50);
    digitalWrite(pin, LOW);
    delay(50);
a
  }


 }