int a=33;
int b=25;
int c=26;
int d=18;
int e=19;
int f=5;
void setup()
{
  Serial.begin(115200);
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
}
void loop() 
{
  digitalWrite(a,HIGH);
  digitalWrite(f, HIGH);
  delay(1000);
  digitalWrite(a,LOW);
  digitalWrite(f, LOW);
  delay(1000);
  digitalWrite(b, HIGH);
  digitalWrite(e, HIGH);
  delay(1000);
  digitalWrite(b, LOW);
  digitalWrite(e, LOW);
  delay(1000);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  delay(1000);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  delay(1000);
}