#include 

using namespace std;
class student {
private:
    string name, surname;
    int age;
public:
    student(string _name = "", string _surname = "", int _age = 0) {
        name = _name;
        surname = _surname;
        age = _age;
    }
    friend void check_age(student S);
    friend class CS;
    
};
void check_age(student s) {
    if(s.age > 25) {
        cout << "YES " << s.name << " " << s.surname << endl;
    }
    else {
        cout << "NO" << endl;
    }
}
class CS {
private:
    int x, y;
public:
    CS(int _x, int _y) {
        x = _x;
        y = _y;
    }
    void print(student s) {
        cout << s.name << " " << s.surname << " " <