my serial monitor is not showing anything

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

void loop()
{

Serial.println("ABCD");
}

I wrote this simplest code in my arduino software(1.8.5) when I uploaded it on the arduino uno and open the serial monitor it did not show any thing as output even though I kept same baudrate in serial monitor.
plz tell me the solution for this as fast as possible

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