int a=7;
int b=3;
int c=4;
int d=5;
int e=6;
int g=8;
int h=9;
int dp=2;
void digital_3(void)
{
  unsigned char j;
  digitalWrite(a, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(h, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(dp, LOW);
}
void digital_4(void)
{
  unsigned char j;
  digitalWrite(a, LOW);
  digitalWrite(c, LOW);
  digitalWrite(g, LOW);
  digitalWrite(b, LOW);
  digitalWrite(h, LOW);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(dp, LOW);
}
void setup()
{
  int i;
  for(i=2;i<=9;i++)
  pinMode(i, OUTPUT);
}
void loop()
{
  while(1)
{
  digital_3();
  delay(2000);
  digital_4();
  delay(2000);
}
}