void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);


for (int i = 1; i<=3; i++) {
    for (int j = 1; j<=6 - i; j++){
    Serial.print ("*");
    }
    for (int j = 1; j<=i; j++) {
    Serial.print("*");
    }
  Serial.println();
  }
}

void loop(){
}