int a=13;
int b=12;
int c=14;
int d=2;
int e=4;
int f=15;
int s1=27;
int s2=25;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(a,OUTPUT);
  pinMode(b,OUTPUT);
  pinMode(c,OUTPUT);
  pinMode(d,OUTPUT);
  pinMode(e,OUTPUT);
  pinMode(f,OUTPUT);
  pinMode(s1,INPUT);
  pinMode(s2, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly: 
  if(s1==1)
  {
   digitalWrite(a,HIGH);digitalWrite(f, HIGH);
   delay(1000); 
  }

   else
   {
   (s1==0);
   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);
}