const int redLED = 4;
const int greenLED = 5;
void setup() {
  pinMode(redLED,OUTPUT);
  pinMode(greenLED,OUTPUT);
}

void loop() {
  digitalWrite(redLED,HIGH);
  digitalWrite(greenLED,HIGH);
  delay(2000);
  digitalWrite(redLED,LOW);
  digitalWrite(greenLED,LOW);
  delay(2000);
}