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serial monitor problem

Hi guys, when i had compile the coding below which is from the ide itsel to the sakura board , it does not shows anything on the serial monitor . Does anyone know what is the problem?

Reads an analog input on pin 0, prints the result to the serial monitor.
Attach the center pin of a potentiometer to pin A0, and the outside pins to +3.3V and ground.

This example code is in the public domain.

// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 9600 bits per second:

// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
delay(1); // delay in between reads for stability