void setup() {
  // put your setup code here, to run once:
  for(int i=8; i<=13; i++){
    pinMode(i,OUTPUT);
  }
  pinMode(4, INPUT);
  pinMode(5, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(4) == LOW && digitalRead(5) == LOW) digitalWrite(13,HIGH);
  if(digitalRead(4) == HIGH){
    
    for(int i=13; i>=8; i--){
    digitalWrite(i, HIGH);
    digitalWrite(i-1, HIGH);
    delay(100);
    digitalWrite(i, LOW);
    digitalWrite(i-1, LOW);
    
  }

  }else if(digitalRead(5) == HIGH ){
    for(int i=8; i<=13; i++){
    digitalWrite(i, HIGH);
    digitalWrite(i+1, HIGH);
    delay(100);
    digitalWrite(i, LOW);
    digitalWrite(i+1, LOW);
  }
  }

}