Sending full word commands via serial monitor

Just got my arduino. I put together this sketch to turn on an led when I type A into the serial monitor and to turn it off when I type B into the serial monitor. It works great but how do I get it to work with full words. I want to be able to type turnOn13 in the serial monitor instead of just A to get the led to turn on and turnOff13 instead of just B to get it to turn off.

char val; // variable to receive data from the serial port
int ledPin = 13;

void setup() {
      Serial.begin(9600);      // opens serial port, sets data rate to 9600 bps
        pinMode(ledPin, OUTPUT); 
}

void loop() {

  if( Serial.available() )       // if data is available to read
  {
    val = Serial.read();         // read it and store it in 'val'
    Serial.print("I received: ");
    Serial.println(val);
  }
  if( val == 'A' ) digitalWrite(ledPin, HIGH);  // turn ON the LED
  if( val == 'B' ) digitalWrite(ledPin, LOW);   // turn OFF the LED
  delay(100);                                   // wait 100ms
}

Have a look at the strcmp function that compares two strings.

thanks