void led_off () {
  for (int i=8; i<14; i++){
    digitalWrite(i,0);
  }
}

void setup() {
  // put your setup code here, to run once:
  pinMode(A0, INPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int rez = analogRead(A0);
  int led = map (rez,1,1023,8,13);
  digitalWrite (led, 1); 
  delay(50);
  led_off ();
}