byte co [40]={2, 3, 4, 5, 6, 7, 8, 9,
              10, 11, 12, 14, 15, 16, 17, 18,
              19, 22, 23, 24, 25, 26, 27, 28,
              29, 30, 31, 32, 33, 34, 35, 36,
              37, 38, 39, 40, 41, 42, 43, 44};

void setup() 
{
  for (byte i = 0; i <40; i++)
  {
    pinMode (co[i], OUTPUT);
    digitalWrite(co[i], LOW);
  }
  pinMode (A15, OUTPUT);
  pinMode (A14, OUTPUT);
  pinMode (A13, OUTPUT);
  pinMode (A12, OUTPUT);
  pinMode (A11, OUTPUT);
  pinMode (A10, OUTPUT);
  pinMode (A9, OUTPUT);
  pinMode (A8, OUTPUT);
  digitalWrite (A15, HIGH);
  digitalWrite (A14, HIGH);
  digitalWrite (A13, HIGH);
  digitalWrite (A12, HIGH);
  digitalWrite (A11, HIGH);
  digitalWrite (A10, HIGH);
  digitalWrite (A9, HIGH);
  digitalWrite (A8, HIGH);
}

void loop() 
{
  digitalWrite (A15, LOW);
  delay (1000);
  digitalWrite (A15, HIGH);
  delay (1000);
}