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:
  // To Display "0"
  digitalWrite(A, LOW);
  digitalWrite(B, LOW);
  digitalWrite(C, LOW);
  digitalWrite(D, LOW);
  digitalWrite(E, LOW);
  digitalWrite(F, LOW);
  digitalWrite(G, HIGH);
  delay(1000);
}