void setup() {
  DDRF = 0xFF;
  DDRA = 0xFF;
}

void loop() {
  const unsigned char Seg_a[10] = {0x40,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
  for (int i = 0 ; i<10 ; i++) {
    PORTF = Seg_a[i];
    for (int j = 0 ; j<10 ; j++) {
      PORTA = Seg_a[j];
      delay(150);
    }
  }
}