#include <iostream>

using namespace std;

int main()
{
    string a;
    getline (cin, a);

    string b;
    for (int i = 0; i < a.size(); i ++ )
    {
    b += (char)a[i] + (char)a[(i + 1) % a.size()];


    }
    cout << b << endl;
}