text: #include <iostream>
  #include <sstream>
  using namespace std;
  
  /*
  Enter code for class Student here.
  Read statement for specification.
  */
  class Student {
  
  private:
      int age, standard;
      string first_name, last_name;
  
  public:
      void set_age(int age) {
          this->age = age; 
      };
  
      int get_age() { 
          return age;
      }
      
      void set_standard(int standard) { 
        this->standard = standard; 
      };
      
      int get_standard() {
        return standard;
      }
  
      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; 
      }
  
      string to_string() {
          stringstream ss;
          ss << this->age << "," 
             << this->first_name << "," 
             << this->last_name << "," 
             << this->standard;
          string s;
          ss >> s;
          return s;
      }
  };
  
  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;
  }
  
  
  