#include <iostream>
#include <cstring>



const int XL = 100;

using namespace std;

int main ()
{

    int n,k = 0; cin >> n;

    char a[XL][XL];
    char b[XL];



    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
    }

        for (int j = 0; j < n; j++)
        {
                a[j][0] = b[j];
        }

    for (int i = 0; i < n; i++)
    {
        cout << b[i];
    }




}