#define LED_A 2
#define LED_B 3
#define LED_C 4
#define LED_D 5
#define LED_E 6
void setup()
{
 pinMode (LED_A, OUTPUT);
 pinMode (LED_B, OUTPUT);
 pinMode (LED_C, OUTPUT);
 pinMode (LED_D, OUTPUT);
 pinMode (LED_E, OUTPUT);
}

void loop()
{
  
  digitalWrite (LED_A, HIGH);
  digitalWrite (LED_B, LOW);
  digitalWrite (LED_C, LOW);
  digitalWrite (LED_D, LOW);
  digitalWrite (LED_E, LOW);
    delay (50);

   digitalWrite (LED_A, LOW);
   digitalWrite (LED_B, HIGH);
   digitalWrite (LED_C, LOW);
   digitalWrite (LED_D, LOW);
   digitalWrite (LED_E, LOW);
     delay (50);

   digitalWrite (LED_A, LOW);
   digitalWrite (LED_B, LOW);
   digitalWrite (LED_C, HIGH);
   digitalWrite (LED_D, LOW);
   digitalWrite (LED_E, LOW);
     delay (50); 

   digitalWrite (LED_A, LOW);
   digitalWrite (LED_B, LOW);
   digitalWrite (LED_C, LOW);
   digitalWrite (LED_D, HIGH);
   digitalWrite (LED_E, LOW);
     delay (50);  

   digitalWrite (LED_A, LOW);
   digitalWrite (LED_B, LOW);
   digitalWrite (LED_C, LOW);
   digitalWrite (LED_D, LOW);
   digitalWrite (LED_E, HIGH);
     delay (50);  
     }