void setup() {
pinMode (12, OUTPUT);
pinMode(13, OUTPUT);
pinMode (26, OUTPUT);
}

void loop() {
digitalWrite (12, HIGH);
delay (1000);
digitalWrite (12, LOW);
delay (1000);

digitalWrite(13, HIGH);
delay (1000);
digitalWrite(13, LOW);
delay (1000);

digitalWrite (26,HIGH);
delay (1000);
digitalWrite (26, LOW);
delay (1000);

}