#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
int main()
{
    int N, cnt;
    cin >> N;
    cin.ignore();
    string min;
    string t;
    cin >> t;
    cin.ignore();
    min = t;
    for (int i = 1; i < N; i++) {
        cerr << min << endl;
        cin >> t;
        cin.ignore();
        cerr << t << "<" << min << endl;
        if (t[0] < min[0]) {
            min = t;
        }
        else if (t[0] == min[0]) {
            if (t[1] < min[1]) {
                cerr << "~" << t[1] << "<" << min[1]<< endl;
                min = t;
            }

            else if (t[1] == min[1] && t[3] < min[3]) {
                cerr << "#" << t[3] << "<" << min[3]<< endl;
                min = t;
                cnt = 1;
            }
            if (cnt != 1)
                if (t[3] == min[3]) {
                    if (t[4] < min[4]) {
                        min = t;
                    }

                    else if (t[6] < min[6]) {
                        min = t;
                    }
                    else if (t[6] == min[6]) {
                        if (t[7] < min[7])
                            min = t;
                    }
                }
        }
    }

    // Write an action using cout. DON'T FORGET THE "<< endl"
    //  cerr << "Debug messages..." << endl;

    cout << min << endl;
}