Unknows letters appearing when using serial monitor

Hello,
i am new to arduino so,i follow this tutorial

i followed everything right(including the programming) and when i clicked on the serial monitor, it showed me unknown letters instead of numbers. i set up the port correctly also
this is the picture what happened.

sorry for bad english

Have you checked to see if the serial port on your PC is set to the same baud rate as your Arduino is sending?

Weedpharma

Bad BAUD setup.
Match your Serial.begin(X baud) with Baud at Serial Monitor at the lower right.

surbyte:
Bad BAUD setup.
Match your Serial.begin(X baud) with Baud at Serial Monitor at the lower right.

Nice! it worked now ! thanks man