int R = 12;
int Y = 11;
int G = 10;

void setup() {
  // put your setup code here, to run once:
  pinMode(R, OUTPUT);
  pinMode(Y, OUTPUT);
  pinMode(G, OUTPUT);

}

void loop() {
digitalWrite(R, HIGH);
digitalWrite(Y, LOW);
digitalWrite(G, LOW);
delay(330);
digitalWrite(R, LOW);
digitalWrite(Y, HIGH);
digitalWrite(G, LOW);
delay(330);
digitalWrite(R, LOW);
digitalWrite(Y, LOW);
digitalWrite(G, HIGH);
delay(330);
digitalWrite(G, LOW);
  // put your main code here, to run repeatedly:
}