#include <iostream>
#include <string>
using namespace std;

int main(){
    string sent1, sent2, sent3;
    int n;
    cin >> n;
    for(int i = 0; i < n; i++){
        cin >> sent1;
        if(n == 1){
            cout << sent1;
        }
        else if(i == 0) sent2 = sent1;
        else if(i > 0){
            sent2 += sent1;
        }
    }
    cout << sent2 << endl;
    
    return 0;
}