SGU 347 字符串

/********************************************************************************
	今天天气挺冷的～切水题热热手～
********************************************************************************/
#include <iostream>
#include <algorithm>
#include <complex>
#include <cstdlib>
#include <cstring>
#include <utility>
#include <bitset>
#include <cctype>
#include <cstdio>
#include <memory>
#include <string>
#include <vector>
#include <cmath>
#include <ctime>
#include <queue>
#include <stack>
#include <list>
#include <map>
#include <set>
using namespace std;

#define lowbit(x) ( (x) & ( (x) ^ (x - 1) ) )

//typedef long long LL;
//typedef unsigned long long ULL;
typedef __int64 LL;
typedef unsigned __int64 ULL;

typedef pair<int, int> PII;
typedef pair<double, double> PDD;

typedef map<int, int>::iterator MI;
typedef vector<int>::iterator VI;
typedef list<LL>::iterator LI;
typedef set<int>::iterator SI;

const int INF_INT = 0x3f3f3f3f;
const LL INF_LL = 0x7fffffffffffffff;
const double oo = 10e9;
const double eps = 10e-7;
const double PI = acos(-1.0);

const int MAXN = 104;

bool cmp(const string &sa, const string &sb)
{
	return sa + sb < sb + sa;
}
void ace()
{
	int n;
	string str[MAXN];
	cin >> n;
	for (int i = 0; i < n; ++i)
	{
		cin >> str[i];
	}
	sort(str, str + n, cmp);
	for (int i = 0; i < n; ++i)
	{
		cout << str[i];
	}
	cout << endl;
	return ;
}
int main()
{
	ace();
	//system("pause");
	return 0;
}