#define A 2
#define B 3
#define C 4
#define D 5
#define E 6
#define F 7
#define G 8

void setup() {
  // put your setup code here, to run once:
  pinMode(A,OUTPUT);
  pinMode(B,OUTPUT);
  pinMode(C,OUTPUT);
  pinMode(D,OUTPUT);
  pinMode(E,OUTPUT);
  pinMode(F,OUTPUT);
  pinMode(G,OUTPUT);
}
int a;
void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(A,0);
  digitalWrite(B,0);
  digitalWrite(C,0);
  digitalWrite(D,1);
  digitalWrite(E,0);
  digitalWrite(F,0);
  digitalWrite(G,0);
  delay(20); 


}