const int Leds[]={2,4,6,8};
const int LED = 4;
void setup(){
  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");
    }
  }
}