#define RED_LED     6
#define YELLOW_LED  5

unsigned long previousRed = 0;
unsigned long previousYellow = 0;

const unsigned long redInterval = 1000;
const unsigned long yellowInterval = 250;

bool redState = LOW;
bool yellowState = LOW;

void setup() {
  pinMode(RED_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);

  digitalWrite(RED_LED, LOW);
  digitalWrite(YELLOW_LED, LOW);

  Serial.begin(9600);
}

void loop() {
  unsigned long currentMillis = millis();

  // Task 1 : Red LED Blink
  if (currentMillis - previousRed >= redInterval) {
    previousRed = currentMillis;

    redState = !redState;
    digitalWrite(RED_LED, redState);
  }

  // Task 2 : Yellow LED Blink
  if (currentMillis - previousYellow >= yellowInterval) {
    previousYellow = currentMillis;

    yellowState = !yellowState;
    digitalWrite(YELLOW_LED, yellowState);
  }
}