void setup() {
  pinMode(23, INPUT);
  pinMode(22, INPUT);
  pinMode(21, INPUT);
  pinMode(12, OUTPUT);
  pinMode(27, OUTPUT);
  pinMode(25, OUTPUT);
}

void loop() {
  if(digitalRead(23)==LOW){
    digitalWrite(12, HIGH);
    digitalWrite(27, HIGH);
    digitalWrite(25, HIGH);
  }
  else{
  digitalWrite(12, LOW);
  digitalWrite(27, LOW);
  digitalWrite(25, LOW);
  }

   if(digitalRead(22)==LOW){
    digitalWrite(12, HIGH);
    delay(200);
    digitalWrite(12, LOW);
    delay(200);
    digitalWrite(27, HIGH);
    delay(200);
    digitalWrite(27, LOW);
    delay(200);
    digitalWrite(25, HIGH);
    delay(200);
    digitalWrite(25, LOW);
    delay(200);
  }
  
  if(digitalRead(21)==LOW){
    digitalWrite(25, HIGH);
    delay(200);
    digitalWrite(25, LOW);
    delay(200);
    digitalWrite(27, HIGH);
    delay(200);
    digitalWrite(27, LOW);
    delay(200);
    digitalWrite(12, HIGH);
    delay(200);
    digitalWrite(12, LOW);
    delay(200);
  }
}