void setup() {
  // put your setup code here, to run once:
pinMode(11, OUTPUT);
pinMode(8, OUTPUT);
pinMode(4,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(11,HIGH);
digitalWrite(8, LOW);
digitalWrite(4, LOW);

delay(1000);
digitalWrite(11,LOW);
digitalWrite(8, HIGH);
digitalWrite(4, LOW);
delay(1000);
digitalWrite(11, LOW);
digitalWrite(8, LOW);
digitalWrite(4, HIGH);
delay(1000);
}