Kopdar Arduino

char str;
  const int buttonPin1 = 10;
  const int buttonPin2 = 11;
  const int buttonPin3= 12;
  const int buttonPin4= 13;

  int buttonState1 = 0;
  int buttonState2 = 0;
  int buttonState3 = 0;
  int buttonState4 = 0;

void setup() {
  Serial.begin(9600);
  pinMode(buttonPin1,INPUT);
  pinMode(buttonPin2,INPUT);
  pinMode(buttonPin3,INPUT);
  pinMode(buttonPin4,INPUT);
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(7,OUTPUT);
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
  }

void loop() {
  if(Serial.available()>0)
    {
      str = Serial.read();
      if(str =='A') digitalWrite(2,HIGH);
      delay(500);
      digitalWrite(2,LOW);
      if(str =='B') digitalWrite(3,HIGH);
      delay(500);
      digitalWrite(3,LOW);
      if(str =='C') digitalWrite(4,HIGH);
      delay(500);
      digitalWrite(4,LOW);
      if(str =='D') digitalWrite(5,HIGH);
      delay(500);
      digitalWrite(5,LOW);
      if(str =='E') digitalWrite(6,HIGH);
      delay(500);
      digitalWrite(6,LOW);
      if(str =='F') digitalWrite(7,HIGH);
      delay(500);
      digitalWrite(7,LOW);
      if(str =='G') digitalWrite(8,HIGH);
      delay(500);
      digitalWrite(8,LOW);
      if(str =='H') digitalWrite(9,HIGH);
      delay(500);
      digitalWrite(9,LOW);
      delay(500);

      buttonState1 = digitalRead(buttonPin1);
      buttonState2 = digitalRead(buttonPin2);
      buttonState3 = digitalRead(buttonPin3);
      buttonState4 = digitalRead(buttonPin4);

      if (buttonState1 == 1);
         Serial.write(1);
         if (buttonState2 == 1);
         Serial.write(2);

    }
  // put your main code here, to run repeatedly:

}