int inPinA = 4;
 int inPinB = 3;
 int outPin = 7;
 int buzzPin = 8;
 void setup()
 {
 //Serial.begin(9600);
 pinMode(inPinA, INPUT);
pinMode(inPinB, INPUT);
 pinMode(outPin, OUTPUT);
 pinMode(buzzPin, OUTPUT);
 digitalWrite(outPin, LOW);
 digitalWrite(buzzPin, LOW);
 }

 void loop()
 {
 bool val1 = digitalRead(inPinA)==HIGH;
 bool val2 = digitalRead(inPinB)==HIGH;


 if((val1 || val2) && !(val1 && val2) ){
 digitalWrite(outPin,HIGH);
 digitalWrite(buzzPin, LOW);
 }else if(val1 && val2){
 digitalWrite(outPin,HIGH);
 digitalWrite(buzzPin, HIGH);
 }else{
 digitalWrite(outPin, LOW);
 digitalWrite(buzzPin, LOW);
 }
 }