int a=2,b=3,c=4,d=5,e=6,f=7,g=8,dl=1000;
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:
  // write 0
digitalWrite(a,1);
digitalWrite(b,1);
digitalWrite(c,1);
digitalWrite(d,1);
digitalWrite(e,1);
digitalWrite(f,1);
digitalWrite(g,0);
delay(dl);
  // write 1
digitalWrite(a,0);
digitalWrite(b,1);
digitalWrite(c,1);
digitalWrite(d,0);
digitalWrite(e,0);
digitalWrite(f,0);
digitalWrite(g,0);
delay(dl);
// write 2
digitalWrite(a,1);
digitalWrite(b,1);
digitalWrite(c,0);
digitalWrite(d,1);
digitalWrite(e,1);
digitalWrite(f,0);
digitalWrite(g,1);
delay(dl);
// write 3
digitalWrite(a,1);
digitalWrite(b,1);
digitalWrite(c,1);
digitalWrite(d,1);
digitalWrite(e,0);
digitalWrite(f,0);
digitalWrite(g,1);
delay(dl);
// write 4
digitalWrite(a,0);
digitalWrite(b,1);
digitalWrite(c,1);
digitalWrite(d,0);
digitalWrite(e,0);
digitalWrite(f,1);
digitalWrite(g,1);
delay(dl);
// write 5
digitalWrite(a,1);
digitalWrite(b,0);
digitalWrite(c,1);
digitalWrite(d,1);
digitalWrite(e,0);
digitalWrite(f,1);
digitalWrite(g,1);
delay(dl);
//write 6
digitalWrite(a,1);
digitalWrite(b,0);
digitalWrite(c,1);
digitalWrite(d,1);
digitalWrite(e,1);
digitalWrite(f,1);
digitalWrite(g,1);
delay(dl);
// write 7
digitalWrite(a,1);
digitalWrite(b,1);
digitalWrite(c,1);
digitalWrite(d,0);
digitalWrite(e,0);
digitalWrite(f,0);
digitalWrite(g,0);
delay(dl);
// write 8
digitalWrite(a,1);
digitalWrite(b,1);
digitalWrite(c,1);
digitalWrite(d,1);
digitalWrite(e,1);
digitalWrite(f,1);
digitalWrite(g,1);
delay(dl);
// write 9
digitalWrite(a,1);
digitalWrite(b,1);
digitalWrite(c,1);
digitalWrite(d,1);
digitalWrite(e,0);
digitalWrite(f,1);
digitalWrite(g,1);
delay(dl);
}