#define blue_led 12
#define green_led 2
// Себежко Александр Андреевич
void setup() 
{
  pinMode(blue_led, OUTPUT);
  pinMode(green_led, OUTPUT);
}

void loop() 
{
  digitalWrite(blue_led, HIGH); 
  delay(500);
  digitalWrite(blue_led, LOW); 
  delay(500);
  digitalWrite(green_led, HIGH);  
  delay(500);
  digitalWrite(green_led, LOW); 
  delay(500);
}