int A = 5;

int A_mass[4] = {2,7,1,9};

int A2_mass[3][3] = 
{
  {1,2,3},
  {4,5,6},
  {7,8,9}
};


void setup() {
  // put your setup code here, to run once:
   Serial.begin(9600);
   randomSeed(analogRead(A0));
  for(int i = 0; i < 3; i++)
  {
    for(int j = 0; j < 3; j++)
    {
      A2_mass[i][j] = random(0,10);
    }
  }

  for(int i = 0; i < 3; i++)
  {
    for(int j = 0; j < 3; j++)
    {
      Serial.print(A2_mass[i][j]);
      Serial.print(" ");
    }
    Serial.println();
  }
  Serial.println("Mass:");
   for(int i = 2; i >= 3; i--)
  {
    for(int j = 2; j >= 3; j--)
    {
      Serial.print(A2_mass[i][j]);
      Serial.print(" ");
    }
    Serial.println();
  }

}

void loop() {
  // put your main code here, to run repeatedly:
 
}