Output symbols with MPU6050


I am using an UNO with 3.3V and baud rate 9600, same in the serial monitor and processing sketch.
I have been trying to run the example here: https://maker.pro/education/imu-interfacing-tutorial-get-started-with-arduino-and-the-mpu-6050-sensor

I have realised that if I were to uncomment #define OUTPUT_READABLE_YAWPITCHROLL, I am able to read my values, else I will only be able to read some weird symbols.

I would like to follow the instructions and be able to read those values and parse them as readable values to processing. May I ask if there is anyone who could give me some suggestions please?