void setup(){
  pinMode(33, OUTPUT);
  pinMode(32, OUTPUT);
  pinMode(25, OUTPUT);
}

void loop(){
  digitalWrite(33, 1);
  digitalWrite(32, 0);
  digitalWrite(25, 0);
  delay(1000);
  digitalWrite(33, 0);
  digitalWrite(32, 1);
  digitalWrite(25, 0);
  delay(1000);
  digitalWrite(33, 0);
  digitalWrite(32, 0);
  digitalWrite(25, 1);
  delay(1000);
}