void setup() {
  // put your setup code here, to run once:


  for(int i=2;i<=9;i++)
    pinMode(i, OUTPUT);
  for(int i=14;i<=17;i++)
    pinMode(i, INPUT_PULLUP);


}

void loop() {
  // put your main code here, to run repeatedly:

int bt1=digitalRead(14);
int bt2=digitalRead(15);
int bt3=digitalRead(16);

if(bt1==LOW)
{

 for (int i=9;i>=2;i--)
  {
      digitalWrite(i, HIGH);
      delay(200);
      digitalWrite(i, LOW);

  }
}

if(bt2==LOW)
{

 for (int i=2;i<=9;i++)
  {
      digitalWrite(i, HIGH);
      delay(200);
      digitalWrite(i, LOW);

  }
}
 
  

}