void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println();

}

int valor;

void loop() {
  if (Serial.available() > 0) {
  String input = Serial.readStringUntil('\n');
  input.trim();

  if (input.startsWith("a")) {
    valor = input.substring(1).toInt();
    Serial.print("Valor: ");
    Serial.println(valor);
  }
  if (input.startsWith("m")) {
    valor = input.substring(1).toInt();
    Serial.print("Mode: ");
    Serial.println(valor);
  }
    
}//end if serial available

}