const int redLedPin = 12;
const int yellowLedPin = 11;
const int greenLedPin = 10;
const int buttonPin = 2;

boolean reverseMode = false;

void setup() {
  pinMode(redLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(buttonPin) == LOW) {
    reverseMode = !reverseMode;
    delay(250); 
  }
  
  if (!reverseMode) {
    digitalWrite(greenLedPin, HIGH);
    delay(1000);
    digitalWrite(greenLedPin, LOW);
    
    for (int i = 0; i < 5; i++) {
      digitalWrite(yellowLedPin, HIGH);
      delay(500);
      digitalWrite(yellowLedPin, LOW);
      delay(500);
    }
    
    digitalWrite(redLedPin, HIGH);
    delay(1000);
    digitalWrite(redLedPin, LOW);
  } else {
    digitalWrite(redLedPin, HIGH);
    delay(1000);
    digitalWrite(redLedPin, LOW);
    
    for (int i = 0; i < 5; i++) {
      digitalWrite(greenLedPin, HIGH);
      delay(500);
      digitalWrite(greenLedPin, LOW);
      delay(500);
    }
    
    digitalWrite(yellowLedPin, HIGH);
    delay(1000);
    digitalWrite(yellowLedPin, LOW);
  }
  
  digitalWrite(redLedPin, LOW);
  digitalWrite(yellowLedPin, LOW);
  digitalWrite(greenLedPin, LOW);
}