int rightbutton = 12;
int leftbutton = 13;
int leftred = 2;
int leftred1 = 3;
int leftyellow = 4;
int leftyellow1 = 5;
int green = 6;
int rightyellow1 = 7;
int rightyellow = 8;
int rightred1 = 9;
int rightred = 10;
int score = 6;

void setup() {
  pinMode(rightbutton, INPUT);
  pinMode(leftbutton, INPUT);
  pinMode(leftred, OUTPUT);
  pinMode(leftred1, OUTPUT);
  pinMode(leftyellow, OUTPUT);
  pinMode(leftyellow1, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(rightyellow1, OUTPUT);
  pinMode(rightyellow, OUTPUT);
  pinMode(rightred1, OUTPUT);
  pinMode(rightred, OUTPUT);

  digitalWrite(rightred, LOW);
  digitalWrite(rightred1, LOW);
  digitalWrite(leftred, LOW);
  digitalWrite(leftred1, LOW);
  digitalWrite(leftyellow, LOW);
  digitalWrite(leftyellow1, LOW);
  digitalWrite(green, HIGH);
  digitalWrite(rightyellow, LOW);
  digitalWrite(rightyellow1, LOW);
}

void loop() {
  while (digitalRead(rightbutton) == 0 && digitalRead(leftbutton) == 0) {}

  if (digitalRead(rightbutton) == 1) {
    while (digitalRead(rightbutton) == 1) {}
    delay(50);
    score = score - 1;
    if (score == 1) {
      score = 2;
    }
  }
  else {
    while (digitalRead(leftbutton) == 1) {}
    delay(50);
    score = score + 1;
    if (score == 11) {
      score = 10;
    }
  }

  digitalWrite(score, HIGH);
  digitalWrite(score + 1, LOW);
  digitalWrite(score - 1, LOW);
}