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

int main(){
    int n; cin >> n;
    string s[n];
    string str;
    cin >> s[0];
    str = s[0];
    for(int i = 1; i < n; i++){
         cin >> s[i];
         str = str + s[i];
}
    cout << str << endl;

    return 0;
}