include

include

using namespace std;

class Student { private: int age; int standard; string first_name; string last_name;

public:
void set_age(int a)
{
    age=a;
}
void set_first_name(string fname)
{
    first_name=fname;
}
void set_last_name(string lname)
{
    last_name=lname;
}
void set_standard(int std)
{
    standard=std;
}

int get_age()
{
    return age;
}
string get_first_name()
{
    return first_name;
}
string get_last_name()
{
    return last_name;
}
int get_standard()
{
    return standard;
}
    string to_string()
{
    stringstream ss;
    ss << age << "," << first_name << "," << last_name << "," << standard;
    return ss.str();
}

};

int main() { int age, standard; string first_name, last_name;

cin >> age >> first_name >> last_name >> standard;

Student st;
st.set_age(age);
st.set_standard(standard);
st.set_first_name(first_name);
st.set_last_name(last_name);

cout << st.get_age() << "\n";
cout << st.get_last_name() << ", " << st.get_first_name() << "\n";
cout << st.get_standard() << "\n";
cout << "\n";
cout << st.to_string();

return 0;

}