String myString;
unsigned long myInt;
int h;

String Message = "Start 1981";

void setup() {
  Serial.begin(115200);
  Serial.println();
}

void loop() {
  

  h = 0;
  while (h < Message.length()) {
    if (isDigit(Message[h])) {
      myString = myString + Message[h]; // add digit to the string
    }
    h++;
  }

  myInt = myString.toInt(); // convert the extracted string to an integer

  myString = "";

  // Output the result
  Serial.print("Extracted number: ");
  Serial.println(myInt);
  
  

  delay(2000);
}