UART's not working with my MEGA

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So if this example is not working then I have another one. I connect my Neo-6m GPS module to Pins 18(rx) and 19(tx). And I used this sample code

void setup() {
 Serial.begin(9600);
 Serial1.begin(9600);
}

void loop() {
  if(Serial1.available())
  Serial.write(Serial1.read());
}

And I have not got printed anything to the Serial monitor. Any help would be appreciated