int red = 13;
int green = 12;
int blue = 11;
int buz = 10;

void setup() {
  // Set all pins as OUTPUT
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(buz, OUTPUT);
}

void loop() {
  // Turn on RED LED and buzzer
  digitalWrite(red, HIGH);
  digitalWrite(buz, HIGH);
  delay(1000); // Wait for 1 second
  digitalWrite(red, LOW);
  digitalWrite(buz, LOW);

  // Turn on GREEN LED and buzzer
  digitalWrite(green, HIGH);
  digitalWrite(buz, HIGH);
  delay(1000); // Wait for 1 second
  digitalWrite(green, LOW);
  digitalWrite(buz, LOW);

  // Turn on BLUE LED and buzzer
  digitalWrite(blue, HIGH);
  digitalWrite(buz, HIGH);
  delay(1000); // Wait for 1 second
  digitalWrite(blue, LOW);
  digitalWrite(buz, LOW);

  delay(1000); // Wait for 1 second before repeating
}