void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(13,1);
  delay(1000);
  digitalWrite(12,0);
  delay(1000);
  digitalWrite(13,0);
  delay(1000);
  digitalWrite(12,1);
  delay(1000);


}