int button1 = 2;
int button2 = 3; 
int L1 = 5;  
int L2 = 6;   

void setup() {
  pinMode(button1, INPUT);
  pinMode(button2, INPUT); 
  pinMode(L1, OUTPUT);
  pinMode(L2, OUTPUT); 
}

void loop() {
  int stateButton1 = digitalRead(button1); 
  int stateButton2 = digitalRead(button2); 
  if (stateButton1 == HIGH && stateButton2 == HIGH) {
    digitalWrite(L1, HIGH);
    digitalWrite(L2, LOW);
    delay(200);
    digitalWrite(L1, LOW);
    digitalWrite(L2, HIGH);
    delay(200);
  }
  else if (stateButton1 == HIGH) {
    digitalWrite(L1, HIGH);
    digitalWrite(L2, LOW);
  }
  else if (stateButton2 == HIGH) {
    digitalWrite(L1, LOW);
    digitalWrite(L2, HIGH);
  }
  else {
    digitalWrite(L1, LOW);
    digitalWrite(L2, LOW);
  }
}