#include<iostream>
using namespace std;
class Student{

  public :
    int rollNumber;

  private :
    int age;

  public :
    void display(){
       cout<<age<<" "<<rollNumber<<endl;
    }

    int getAge(){
      return age;
    }
    void setAge(int a,int password){
        if(password != 123){
            return;
        }
        if(a<0){
            return;
        }
       age = a;
    }
};