Problem with MPU 6050 Raw values

Hi!
I'm having some strange string output in the MPU6050 raw values

The code:

#include "Wire.h"
#include "I2Cdev.h"
#include "MPU6050.h"

MPU6050 mpu;

int16_t ax, ay, az;
int16_t gx, gy, gz;

float sensitivityAccel= 4096.0; 
int fuerza;
int PinSensorFuerza=A0;
float x,y,z;
int periodo=50;


void setup() 
{
    Wire.begin();
    Serial.begin(9600);
    mpu.initialize();
    mpu.setFullScaleAccelRange(MPU6050_ACCEL_FS_8);
}

void loop() 
{
    mpu.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
    fuerza=analogRead(PinSensorFuerza);
    Serial.print(ax);
    Serial.print(",");
    Serial.print(ay);
    Serial.print(",");
    Serial.print(az);
    Serial.print(",");
    Serial.println(fuerza);
    delay(periodo);
}

The first output line has this problem:
ð0.06,-0.67,3.69,15
You can see a strange string apearing always first.
As i'm importing the data to Qt I need it to be only ints.

Someone knows whats happening.

Thanks!

I have been looking at this a while, but I don’t see it.
You could try to add a few more characters.

    Serial.print("<");
    Serial.print(ax);
    Serial.print(",");
    Serial.print(ay);
    Serial.print(",");
    Serial.print(az);
    Serial.print(",");
    Serial.print(fuerza);
    Serial.print(">");
    Serial.println();

Do you use a normal Arduino board ? Or something with bad voltages or wrong frequency ?