const int buttonPin = 2;
const int ledPinR = 13;
const int ledPinB = 12;
int buttonState = 0;

void setup() {
  pinMode(ledPinR, OUTPUT);
  pinMode(ledPinB, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH) {
    digitalWrite(ledPinR, HIGH);
    digitalWrite(ledPinB, LOW);
  }
  else {
    digitalWrite(ledPinB, HIGH);
    digitalWrite(ledPinR, LOW);
  }
}