#include<iostream> #include<cstdio> #include<algorithm> using namespace std; const int NR=110; string a[NR]; bool cmp(string a,string b) { return a+b>b+a; } int main() { int n,i; cin>>n; for(i=1;i<=n;i++) cin>>a[i]; sort(a+1,a+n+1,cmp); for(i=1;i<=n;i++) cout<<a[i]; return 0; }