int led[4] = (25,26,27,14);

void setup() 
{
  for(int a = 0; a <= 3; a++)
  {
 pinMode(led[a], OUTPUT);
 digitalWrite(led[a], LOW);
  }
}

void loop() 
{
  for(int b = 0; b <= 3; b++)
  {
  digitalWrite(led[b], LOW);
  delay(200);
  digitalWrite(led[b], HIGH);
  delay(200);
  }
}