void setup() {
  // put your setup code here, to run once:
  for (int i = 1; i <= 4; i++) {
    pinMode(i, OUTPUT);
  }
  pinMode(9, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  int s;
  s = digitalRead(9);
  if (s == HIGH) {
    for (int i = 1; i <= 4; i++) {
      digitalWrite(i, HIGH);
      delay(1000);
      s = digitalRead(9);
      digitalWrite(i, LOW);
      if (s == LOW) {
        break;
      }
    }
  }
  if (s == LOW) {
    for (int i = 1; i <= 4; i++) {
      digitalWrite(i, LOW);
    }
  }

}