const int redLed1 = 10;
const int yellowLed2 = 6;
const int greenLed3 = 3;

void setup() { 
  pinMode(redLed1, OUTPUT);
  pinMode(yellowLed2, OUTPUT);
  pinMode(greenLed3, OUTPUT);
}

void loop() {
  digitalWrite(redLed1, HIGH);
  delay(6000);
  digitalWrite(redLed1, LOW);

  digitalWrite(yellowLed2, HIGH);
  delay(900);
  digitalWrite(yellowLed2, LOW);

  digitalWrite(greenLed3, HIGH);
  delay(5000);
  digitalWrite(greenLed3, LOW);

  delay(800);
}