int Ypin=6;
int Rpin=9;
int time=300;

void setup() {
  // put your setup code here, to run once:
pinMode(Ypin,OUTPUT);
pinMode(Rpin,OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
{
digitalWrite(Ypin,HIGH);
digitalWrite(Rpin,LOW);
delay(time);
digitalWrite(Ypin,LOW);
digitalWrite(Rpin,LOW);
delay(time);
}
{
digitalWrite(Ypin,LOW);
digitalWrite(Rpin,HIGH);
delay(time);
digitalWrite(Ypin,LOW);
digitalWrite(Rpin,LOW);
delay(time);
}

}