void setup() {
  pinMode(12, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(6, INPUT);
  pinMode(2, INPUT);
}

void loop() {
  digitalWrite(12, LOW);
  digitalWrite(10, LOW);
  digitalWrite(9, LOW);

  if (digitalRead(6) == HIGH) {
    digitalWrite(10, HIGH);
  } else if (digitalRead(2) == HIGH) {
    digitalWrite(9, HIGH);
  } else {
    digitalWrite(12, HIGH);
  }
}