#include <iostream>

using namespace std;

int main() {
    string a, b;
    getline(cin, a);
    int len = a.size();
    for (int i = 0; a[i]; i++) {
        b[i] = a[i]+ a[(i + 1) % len];
        cout << b[i];
    }
    cout << endl;
    return 0;
}