#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
const int N=5e4+3;
int n;
struct node{
string s;
}a[N];
bool cmp(node x,node y){
return x.s+y.s<y.s+x.s;
}
int main()
{
cin>>n;
for(int i=1;i<=n;i++)
cin>>a[i].s;
sort(a+1,a+n+1,cmp);
for(int i=1;i<=n;i++) cout<<a[i].s;
return 0;
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