const int button1 = 13;
const int button2 = 12;
const int button3 = 11;
const int button4 = 10;

const int led1 = 9; 
const int led2 = 8;
const int led3 = 7;
const int led4 = 6;

bool buttonPressed = false; 

void setup() {
  pinMode(button1, INPUT_PULLUP); 
  pinMode(button2, INPUT_PULLUP);
  pinMode(button3, INPUT_PULLUP);
  pinMode(button4, INPUT_PULLUP);

  pinMode(led1, OUTPUT); 
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
}

void loop() {
  if (!buttonPressed) {
    if (digitalRead(button1) == LOW) {
      buttonPressed = true; 
      digitalWrite(led1, HIGH); 
      digitalWrite(led2, LOW); 
      digitalWrite(led3, LOW); 
      digitalWrite(led4, LOW); 
    }
    else if (digitalRead(button2) == LOW) { 
      buttonPressed = true;
      digitalWrite(led1, LOW); 
      digitalWrite(led2, HIGH); 
      digitalWrite(led3, LOW); 
      digitalWrite(led4, LOW); 
    }
    else if (digitalRead(button3) == LOW) { 
      buttonPressed = true;
      digitalWrite(led1, LOW); 
      digitalWrite(led2, LOW); 
      digitalWrite(led3, HIGH); 
      digitalWrite(led4, LOW); 
    }
    else if (digitalRead(button4) == LOW) { 
      buttonPressed = true;
      digitalWrite(led1, LOW); 
      digitalWrite(led2, LOW); 
      digitalWrite(led3, LOW); 
      digitalWrite(led4, HIGH); 
    }
  }

  if (buttonPressed) { 
    delay(2000);

    
    if (digitalRead(button1) == LOW) {
      digitalWrite(led1, LOW);
    }
    else if (digitalRead(button2) == LOW) {
      digitalWrite(led2, LOW);
    }
    else if (digitalRead(button3) == LOW) {
      digitalWrite(led3, LOW);
    }
    else if (digitalRead(button4) == LOW) {
      digitalWrite(led4, LOW);
    }

    
    buttonPressed = false;
  }
}