void setup() {
pinMode(9, OUTPUT);
pinMode(3, OUTPUT);
pinMode(7, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(9,HIGH);
digitalWrite(3,HIGH);
digitalWrite(7, HIGH);
delay(1000);
digitalWrite(9,LOW);
digitalWrite(3,LOW);
digitalWrite(7, LOW);
delay(1000);

}