int red_led = 13;
int green_led = 11;
int blue_led = 9;
int yellow_led = 7;

void setup() {
  // setting up pinmodes
pinMode(13, OUTPUT);
pinMode(11, OUTPUT);
pinMode(9, OUTPUT);
pinMode(7, OUTPUT);

digitalWrite(red_led, HIGH);
digitalWrite(green_led, HIGH);
digitalWrite(blue_led, HIGH);
digitalWrite(yellow_led, HIGH);
delay(2000);
//All lights turn off then wait one second before loop section
digitalWrite(red_led, LOW);
digitalWrite(green_led, LOW);
digitalWrite(blue_led, LOW);
digitalWrite(yellow_led, LOW);
delay(1000);

}

void loop() {
  // put your main code here, to run repeatedly:

}