#include<iostream> #include<algorithm> using namespace std; #define int long long int n; string a[200]; bool cmp(string x,string y){ return x+y<y+x; } signed main(){ cin>>n; for(int i=1;i<=n;i++) cin>>a[i]; sort(a+1,a+1+n,cmp); for(int i=n;i>=1;i--){ cout<<a[i]; } return 0; }