int ledr=2;
int ledo=5;
int ledc=4;
int ledg=15;

void setup() {
  // put your setup code here, to run once:
  pinMode(ledr, OUTPUT);
  pinMode(ledo, OUTPUT);
  pinMode(ledc, OUTPUT);
  pinMode(ledg, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(ledr, HIGH);
  digitalWrite(ledo, HIGH);
  digitalWrite(ledc, HIGH);
  digitalWrite(ledg, HIGH);
  delay(1000);
  digitalWrite(ledr, LOW);
  digitalWrite(ledo, LOW);
  digitalWrite(ledc, LOW);
  digitalWrite(ledg, LOW);
  delay(1000);
}