void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  
  //wait for 3 seconds to ensure serial connection
  delay(3000);

  //print a prompt to serial monitor
  Serial.println("Please enter two numbers seperated by space:");

}

void loop() {
  //check if there is any special input available
  if(Serial.available()>0){
    //read in two integers from serial monitor
    int num1 = Serial.parseInt();
    int num2 = Serial.parseInt();

    //print numbers to Serial monitor
    Serial.print("First number: ");
    Serial.println(num1);
    Serial.print("second number: ");
    Serial.println(num2);

    //prompt for another two numbers
    Serial.println("Please enter two more numbers seperated by space: ");
  }
}