String firstValue, secondValue, thirdValue, myString, inString="";
int r,g,b,inChar;
void setup() 
{
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
}
void loop() 
{
  if (Serial.available()>0)
  {
    inChar = Serial.read();
    changeValues(inChar);
  }
}

void changeValues(int X)
{
  // convert the incoming byte to a char and add it to the string:
    inString += (char)X;
    int commaIndex = inString.indexOf('-');
    //  Search for the next comma just after the first
    int secondCommaIndex = inString.indexOf('-', commaIndex + 1);
    firstValue = inString.substring(0, commaIndex);
    secondValue = inString.substring(commaIndex + 1, secondCommaIndex);
    thirdValue = inString.substring(secondCommaIndex + 1); // To the end of the string
    r = firstValue.toInt();
    g = secondValue.toInt();
    b = thirdValue.toInt();
    analogWrite(9,r);
    analogWrite(10,g);
    analogWrite(11,b);
}