int x = 13;



void setup() {
  Serial.begin(115200);
for(int y =13;y>8;y=y-1) {
  Serial.print(" y =");
  Serial.println(y); 
  pinMode(y, OUTPUT);
  }

}

void loop() {
  Serial.println(x);
  digitalWrite(x, HIGH);
  delay(1200);
  digitalWrite(x, LOW);
  delay(1200);
  x = x - 1;
  if(x<=7){
   x=13;
}
}