void setup() {
  // put your setup code here, to run once:
  pinMode(2, INPUT);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
}

void loop() {
  
  analogWrite(11, 0);
  analogWrite(10, 255);
  analogWrite(9, 255);
  delay(1000);

  
  analogWrite(10, 0);
  analogWrite(11, 255);
  analogWrite(9, 255);
  delay(1000);

  
  analogWrite(9, 0);
  analogWrite(11, 255);
  analogWrite(10, 255);
  delay(1000);

  
}