int A = 2;
int B3 = 3;
int C4 = 4;
int D5 = 5;
int E6 = 6;
int F7 = 7;
int G8 = 8;
int D1 = 10;
int D2 = 11;
int D3 = 12;
int D4 = 13;

void setup() {
  pinMode(A,OUTPUT);
  pinMode(B3,OUTPUT);
  pinMode(C4,OUTPUT);
  pinMode(D5,OUTPUT);
  pinMode(E6,OUTPUT);
  pinMode(F7,OUTPUT);
  pinMode(G8,OUTPUT);
  pinMode(D1,OUTPUT);
  pinMode(D2,OUTPUT);
  pinMode(D3,OUTPUT);
  pinMode(D4,OUTPUT);

}

void loop() {
   digitalWrite(D1,HIGH);
   digitalWrite(D2,LOW);
   digitalWrite(D3,LOW);
   digitalWrite(D4,LOW);

      digitalWrite(B3,0);
      digitalWrite(C4,0);
      digitalWrite(A,1);
      digitalWrite(D5,1);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);

      
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);
  
  
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,0);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);

digitalWrite(D1,LOW);
   digitalWrite(D2,HIGH);
   digitalWrite(D3,LOW);
   digitalWrite(D4,LOW);

      digitalWrite(B3,0);
      digitalWrite(C4,0);
      digitalWrite(A,1);
      digitalWrite(D5,1);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);

      
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);
  
  
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,0);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);

      digitalWrite(D1,LOW);
   digitalWrite(D2,LOW);
   digitalWrite(D3,HIGH);
   digitalWrite(D4,LOW);

      digitalWrite(B3,0);
      digitalWrite(C4,0);
      digitalWrite(A,1);
      digitalWrite(D5,1);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);

      
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);
  
  
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,0);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);

      digitalWrite(D1,LOW);
   digitalWrite(D2,LOW);
   digitalWrite(D3,LOW);
   digitalWrite(D4,HIGH);
   digitalWrite(B3,0);
      digitalWrite(C4,0);
      digitalWrite(A,1);
      digitalWrite(D5,1);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);

      
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);
  
  
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,0);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);



      digitalWrite(D1,HIGH);
   digitalWrite(D2,HIGH);
   digitalWrite(D3,HIGH);
   digitalWrite(D4,HIGH);
digitalWrite(B3,0);
      digitalWrite(C4,0);
      digitalWrite(A,1);
      digitalWrite(D5,1);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);

      
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,1);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);
  
  
      digitalWrite(B3,1);
      digitalWrite(C4,0);
      digitalWrite(A,0);
      digitalWrite(D5,0);
      digitalWrite(E6,0);
      digitalWrite(F7,0);
      digitalWrite(G8,0);
      delay(1000);


    
}