#include<iostream>
#include<algorithm>
using namespace std;
struct birthday
{
	char name[20];
	int year;
	int month;
	int day;
}A[100];
int main()
{
	int a;
	cin>>a;
	for(int i=0;i<=a-1;i++){
		cin>>A[i].name>>A[i].year>>A[i].month>>A[i].day;
	}
	stable_sort(A,A+a);
    for(int i=0;i<=a-1;i++){
		cout<<A[i].name;
	}
	return 0;
}