#include <iostream>
#include <Windows.h>
#include <string>

using namespace std;

struct student_t
{
	string surname;
	string faculty;
	size_t course_id;
};

struct pair_t
{
	string faculty;
	size_t course_id;
};

int main()
{
	SetConsoleOutputCP(1251);
	SetConsoleCP(1251);
	size_t size;
	size_t n_unique = 0;

	cin >> size;
	cin.ignore();
	student_t* students = new student_t[size];
	pair_t* unique_pairs = new pair_t[size];

	for (size_t i = 0; i < size; i++)
	{
		cout << endl << i + 1 << " student: " << endl;
		string tmp_str;
		size_t tmp_id;
		cout << "Enter surname = ";
		getline(cin, tmp_str);
		students[i].surname = tmp_str;

		cout << "Enter faculty = ";
		getline(cin, tmp_str);
		students[i].faculty = tmp_str;

		cout << "Enter course id = ";
		cin >> tmp_id;
		cin.ignore();
		students[i].course_id = tmp_id;

		bool is_unique = true;
		for (size_t j = 0; j < n_unique; j++)
			if (unique_pairs[j].course_id == tmp_id && unique_pairs[j].faculty == tmp_str)
			{
				is_unique = false;
				break;
			}
		if (is_unique)
		{
			unique_pairs[n_unique].faculty = tmp_str;
			unique_pairs[n_unique].course_id = tmp_id;
			n_unique++;
		}
	}

	for (size_t i = 0; i < n_unique; i++)
	{
		string max;
		for (size_t j = 0; j < size; j++)
		{
			if (students[j].faculty == unique_pairs[i].faculty && students[j].course_id == unique_pairs[i].course_id)
				if (students[j].surname.size() > max.size())
					max = students[j].surname;
		}
		cout << "The longest surname on faculty '" << unique_pairs[i].faculty << "' and course '" << unique_pairs[i].course_id << "' is " << max << endl;
	}
	return 0;
}