#include <iostream>
using namespace std;

class abstraction{
    private:
    int a,b;
    
    public:
    void set(int x, int y){
        a=x;
        b=y;
    }
    void display(){
        cout<<"a="<<a<<endl;
        cout<<"b="<<b<<endl;
    }
};

int main() {
    abstraction obj;
    obj.set(10,20);
    obj.display();
    return 0;
}