void setup() {
  // put your setup code here, to run once:
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(9, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:

  if(digitalRead(9) == LOW){
digitalWrite(10, HIGH);
digitalWrite(11, HIGH);
digitalWrite(12, HIGH);
  }else{
    digitalWrite(10, LOW);
  }
}