int a=1;
int b=2;
int c =3;
int d=4;
int e=5;
int f=6;
int g=7;
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);
  }
  void loop() {
    // put your main code here, to run repeatedly:
       // display's NO 0
       digitalWrite(a,LOW);
       digitalWrite(b,LOW);
       digitalWrite(c,LOW);
       digitalWrite(d,LOW);
       digitalWrite(e,LOW);
       digitalWrite(f,LOW);
       digitalWrite(g,HIGH);
       delay(1000); 
       // display's NO 1
       digitalWrite(a,HIGH);
       digitalWrite(b,LOW);
       digitalWrite(c,LOW);
       digitalWrite(d,HIGH);
       digitalWrite(e,HIGH);
       digitalWrite(f,HIGH);
       digitalWrite(g,HIGH);
       delay(1000);
       // display's NO 2
       digitalWrite(a,LOW);
       digitalWrite(b,LOW);
       digitalWrite(c,HIGH);
       digitalWrite(d,LOW);
       digitalWrite(e,LOW);
       digitalWrite(f,HIGH);
       digitalWrite(g,LOW);
       delay(1000);
       // DISPLAY NUMBER 3
       digitalWrite(a,LOW);
       digitalWrite(b,LOW);
       digitalWrite(c,LOW);
       digitalWrite(d,LOW);
       digitalWrite(e,HIGH);
       digitalWrite(f,HIGH);
       digitalWrite(g,LOW);
       delay(1000);
       // DISPLAYING NUMBER 4
       digitalWrite(a,HIGH);
       digitalWrite(b,LOW);
       digitalWrite(c,LOW);
       digitalWrite(d,HIGH);
       digitalWrite(e,HIGH);
       digitalWrite(f,LOW);
       digitalWrite(g,LOW);
       delay(1000);
       // DISPLAYING NUMBER 5
       digitalWrite(a,LOW);
       digitalWrite(b,HIGH);
       digitalWrite(c,LOW);
       digitalWrite(d,LOW);
       digitalWrite(e,HIGH);
       digitalWrite(f,LOW);
       digitalWrite(g,LOW);
       delay(1000);
       // DISPLAYING NUMBER 6
       digitalWrite(a,LOW);
       digitalWrite(b,HIGH);
       digitalWrite(c,LOW);
       digitalWrite(d,LOW);
       digitalWrite(e,LOW);
       digitalWrite(f,LOW);
       digitalWrite(g,LOW);
       delay(1000);
       // DISPLAYING NUMBER 7
       digitalWrite(a,LOW);
       digitalWrite(b,LOW);
       digitalWrite(c,LOW);
       digitalWrite(d,HIGH);
       digitalWrite(e,HIGH);
       digitalWrite(f,HIGH);
       digitalWrite(g,HIGH);
       delay(1000);
       // DISPLAYING NUMBER 8
       digitalWrite(a,LOW);
       digitalWrite(b,LOW);
       digitalWrite(c,LOW);
       digitalWrite(d,LOW);
       digitalWrite(e,LOW);
       digitalWrite(f,LOW);
       digitalWrite(g,LOW);
       delay(1000);
       // DISPLAYING NUMBER 9
       digitalWrite(a,LOW);
       digitalWrite(b,LOW);
       digitalWrite(c,LOW);
       digitalWrite(d,LOW);
       digitalWrite(e,HIGH);
       digitalWrite(f,LOW);
       digitalWrite(g,LOW);
       delay(1000);
       }