#include <string>
void setup() {
  pinMode(0, OUTPUT); // A
  pinMode(1, OUTPUT); // B
  pinMode(2, OUTPUT); // C
  pinMode(3, OUTPUT); // D
  pinMode(4, OUTPUT); // E
  pinMode(5, OUTPUT); // F
  pinMode(6, OUTPUT); // G
  pinMode(8, OUTPUT); // H
  pinMode(18, OUTPUT); //Dig1
  pinMode(19, OUTPUT); //Dig2
  pinMode(20, OUTPUT); //Dig3
  pinMode(21, OUTPUT); //Dig4
  int numbers[10] = [0,1,2,3,4,5,6,7,8,9]
  string characterized_numbers [10] = [["A","B","C","D","E","F"]]
}

void loop() {
  digitalWrite(18, HIGH);
  digitalWrite(19, LOW);
  digitalWrite(20, LOW);
  digitalWrite(21, LOW);
  digitalWrite(0, LOW);
  digitalWrite(1, HIGH);
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(8, HIGH);
}