int a=13;
int b=12;
int c=14;
int d=27;
int e=26;
int f=25;
void setup(){
pinMode(a, OUTPUT);
pinMode(b,OUTPUT);
pinMode(c, OUTPUT);
pinMode(d, OUTPUT);
pinMode(e, OUTPUT);
pinMode(f, OUTPUT);
}
void loop(){
 digitalWrite(a, LOW);
 digitalWrite(b, HIGH);
 digitalWrite(c, LOW);
 digitalWrite(d, LOW);
 digitalWrite(e, HIGH);
 digitalWrite(f, LOW);
 delay(1000);
 digitalWrite(a, HIGH);
 digitalWrite(b, HIGH);
 digitalWrite(c, LOW);
 digitalWrite(d, HIGH);
 digitalWrite(e, HIGH);
 digitalWrite(f, LOW);
 delay(1000);