const int Leds[] = {8,6,4,2};
const int LED = 4; 
void setup() {
  // put your setup code here, to run once:
  Serial1.begin(9600);
  Serial1.println("Hello, Raspberry Pi Pico!");
  for (int i = 0; i < LED; i++) {
    pinMode(Leds[i], OUTPUT);
  }
}

void loop() {
  if (Serial1.available() > 0) {
    int userInput = Serial1.parseInt();

    if (userInput >= 1 && userInput <= LED) {
      for (int i = 0; i < LED; i++) {
        digitalWrite(Leds[i], LOW);
      }

      digitalWrite(Leds[userInput - 1], HIGH);
      Serial1.print(userInput);
      Serial1.println("ON");
    }
    
  }
}