class Student{
    private:
        int age;
        string first_name;
        string last_name;
        int standard;
    public:
        
        int get_age(){
            return this->age;
        }
        void set_age(int age){
            this->age = age;
        }
        
        string get_first_name(){
            return this->first_name;
        }

        void set_first_name(string first_name){
            this->first_name = first_name;
        }
        string get_last_name(){
            return this->last_name;
        }
        void set_last_name(string last_name){
            this->last_name = last_name;
        }
        
        int get_standard(){
            return this->standard;
        }
        void set_standard(int standard){
            this->standard = standard;
        }
        
        string to_string(){
            return std::to_string(this->age) + "," + this->first_name + "," + this->last_name + "," + std::to_string(this->standard); 
        }    
};

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

class Student
{
private:
    int m_age, m_standart;
    string m_first_name, m_last_name;

public:
    int getAge()
    {
        return m_age;
    }
    void setAge(int age)
    {
        m_age = age;
    }
    int getStandart()
    {
        return m_standart;
    }
    void setStandart(int standart)
    {
        m_standart = standart;
    }
    string getFirstName()
    {
        return m_first_name;
    }
    void setFirstName(string first_name)
    {
        m_first_name = first_name;
    }
    string getLastName()
    {
        return m_last_name;
    }
    void setLastName(string last_name)
    {
        m_last_name = last_name;
    }

    string toString()
    {
        stringstream ss;
        char comma = ',';
        ss << m_age << comma
           << m_first_name << comma
           << m_last_name << comma
           << m_standart;
        return ss.str();
    }
};

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

    cin >> age >> first_name >> last_name >> standart;

    Student student;
    student.setAge(age);
    student.setFirstName(first_name);
    student.setLastName(last_name);
    student.setStandart(standart);

    cout << student.getAge() << endl;
    cout << student.getLastName() << ", " << student.getFirstName() << endl;
    cout << student.getStandart() << endl;

    cout << endl
         << student.toString();
}

#include <sstream>

class Student {
    private:
        int age;
        string first_name;
        string last_name;
        int standard;
        
    public:
        void set_age(int age) {
            this->age = age;
        }
        int get_age() {
            return age;
        }
        
        void set_first_name(string first_name) {
            this->first_name = first_name;
        }
        string get_first_name() {
            return first_name;
        }
        
        void set_last_name(string last_name) {
            this->last_name = last_name;
        }
        string get_last_name() {
            return last_name;
        }
        
        void set_standard(int standard) {
            this->standard = standard;
        }
        int get_standard() {
            return standard;
        }
        
        string to_string() {
            ostringstream oss;
            oss << age << ',' << first_name << ',' << last_name << ',' << standard;
            return oss.str();
        }
};