#include <bits/stdc++.h>
using namespace std;

#define repl(i,a,b) for(int i=(int)a;i<(int)b;i++)
#define rep(i,n) repl(i,0,n)

int main(){
  int n;
  string res;
  cin>>n;
  rep(i,n){
    string t;
    cin>>t;
    res+=t;
  }
  cout<<res<<endl;
  return 0;
}