void setup() {
  Serial.begin(9600);           
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(7, INPUT_PULLUP);
  pinMode(8, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);

  digitalWrite(11, LOW);
  digitalWrite(12, LOW);
}

void loop() {

  if(digitalRead(7) == LOW) {
    digitalWrite(12, HIGH);
    digitalWrite(11, LOW);
    delay(1000);
    digitalWrite(11, HIGH);
  }

  if(digitalRead(8) == LOW) {
    digitalWrite(12, LOW);
    digitalWrite(11, HIGH);
    delay(1000);
    digitalWrite(12, HIGH);  
  }

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