void setup() {
  pinMode(10, OUTPUT);
  pinMode(9,OUTPUT);
  Serial.begin(9600);
  randomSeed(analogRead(A0));
}

void loop() {
  int randomNumber = random(9,11);
  Serial.println(randomNumber);
  digitalWrite(randomNumber, HIGH);
  delay(1000);
  digitalWrite(randomNumber, LOW);
  delay(1000);
}