#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;
}