#include <iostream>
using namespace std;
class A{
    protected:
    int x=10;
    int y=20;
};
class B:public A{
    void display1(){
        cout<<x<<" "<<y;
    }   
};
class C:public B{
    void display(){
      //  cout<<x;
    }
};
int main(){
    B,b1;
    b1.display();
    return 0;
}