const int buttonPin = 4;    // Pin for the button
const int ledPins[] = {12, 11, 10, 9, 8, 7, 6, 5}; // Pins for the LEDs
const int numLeds = 8;      // Number of LEDs
int buttonState = 0;        // Variable for reading the button status

void setup() {
  // Initialize the LED pins as outputs
  for (int i = 0; i < numLeds; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
  // Initialize the button pin as input
  pinMode(buttonPin, INPUT);
}

void loop() {
  // Read the state of the button
  buttonState = digitalRead(buttonPin);

  // If the button is pressed
  if (buttonState == HIGH) {
    // Turn on each LED one by one with a delay
    for (int i = 0; i < numLeds; i++) {
      if (digitalRead(buttonPin) == LOW) {
        // If the button is released, turn off all LEDs and break the loop
        for (int j = 0; j < numLeds; j++) {
          digitalWrite(ledPins[j], LOW);
        }
        break;
      }
      digitalWrite(ledPins[i], HIGH);
      delay(200); // Delay for 200 milliseconds
    }
  } else {
    // If the button is not pressed, turn off all LEDs
    for (int i = 0; i < numLeds; i++) {
      digitalWrite(ledPins[i], LOW);
    }
  }
}