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

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite (9,HIGH);
  delay (200);
  while (digitalRead(8)==HIGH) {
    delay(300);
  }
  digitalWrite (9, LOW);
  digitalWrite(10, HIGH);
  delay (200);
  while (digitalRead(8)==HIGH) {
    delay(300);
  }
  digitalWrite(10, LOW);
  digitalWrite(11, HIGH);
  delay (200);
  while (digitalRead(8)==HIGH) {
    delay(300);
  }
  digitalWrite(11, LOW);

}