#define RED PA5
#define YELLOW PA6
#define GREEN PA7
#define PURPLE PB6
#define CYAN PB7

void setup() {
  pinMode(RED, OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(PURPLE, OUTPUT);
  pinMode(CYAN, OUTPUT);
  digitalWrite(RED, LOW);
  digitalWrite(YELLOW, LOW);
  digitalWrite(GREEN, LOW);
  digitalWrite(PURPLE, LOW);
  digitalWrite(CYAN, LOW);
}

void loop() {
  int leds[] ={PA5, PA6, PA7, PB6, PB7};
  for(int i = 0;i <5;i++)
{digitalWrite(leds[i],HIGH);
delay(200);
digitalWrite(leds[i],LOW);}
  for(int i = 4; i >= 0; i--) {
digitalWrite(leds[i], HIGH);
delay(200);
digitalWrite(leds[i], LOW);
  }
}