#define LED_PIN_1 7
#define LED_PIN_2 8
#define BUTTON 12
int buttonState=0;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_PIN_1, OUTPUT);
  pinMode(LED_PIN_2, OUTPUT);
  pinMode(BUTTON, INPUT);

  digitalWrite(LED_PIN_1, LOW);
  digitalWrite(LED_PIN_2, LOW);

}

void loop() {
  // put your main code here, to run repeatedly:
  buttonState=digitalRead(BUTTON);
  if(buttonState==HIGH){
    for(int i=0;i<10;i++){
      digitalWrite(LED_PIN_1, HIGH);
      digitalWrite(LED_PIN_2, LOW);
      delay(500);
      digitalWrite(LED_PIN_1, LOW);
      digitalWrite(LED_PIN_2, HIGH);
      delay(500);
    }  
   
  }
  digitalWrite(LED_PIN_1,LOW);
  digitalWrite(LED_PIN_2,LOW);

}