#include <iostream>
#include <vector>
#include <string>
#include <fstream>
#include <algorithm>
using namespace std;

class Student{
public:
	string nume, prenume, grupa;
	string stringify(){
		return nume+" "+prenume+" "+grupa;
	}
};

bool studentCompare(const Student a, const Student b){
	if(a.nume == b.nume){
		if(a.prenume <= b.prenume){
			return true;
		}
		else{
			return false;
		}
	}
	else if(a.nume <= b.nume){
		return true;
	}
	else{
		return false;
	}
}

int main(){
	ios::sync_with_stdio(false);

	fstream f;

	f.open("an.txt", ios_base::in);
	if(!f.is_open()){
		cout<<"Error: file does not exist";
		return 1;
	}

	vector<Student> v;

	string buff;
	while(f>>buff){
		Student tmp;
		tmp.nume = buff;
		f>>tmp.prenume;
		f>>tmp.grupa;
		v.push_back(tmp);
	}
	f.close();

	sort(v.begin(), v.end(), studentCompare);

	f.open("an_sort.txt", ios_base::out);
	for(vector<Student>::iterator it = v.begin(); it < v.end(); it++){
		f<<it->stringify();
		f<<"\n";
	}
	f.close();

	return 0;
}