void setup()
{
  pinMode(9, INPUT);
  pinMode(13, OUTPUT);
}

void loop()
{
  if (digitalRead(9) == 1) {
    digitalWrite(13, HIGH);
    delay(1000); // Wait for 1000 millisecond(s)
    digitalWrite(13, LOW);
    delay(1000); // Wait for 1000 millisecond(s)
  }
}