#include <iostream> #include <vector> #include <map> #include<string> #include<queue> #include<math.h> #define ll long long #define P pair<int,int> #define lP pait<ll,ll> using namespace std; int main() { ll n; string s; cin>>n; for(int i=0;i<n;i++){ string t; cin>>t; s+=t; } cout<<s<<endl; return 0; }