//公式：b[i] = a[i] + a[(i + 1) % lenth]
#include <iostream>
#include <cstring>
#include <algorithm>

using namespace std;

string a;

int main()
{
    cin >> a;
    int lenth = a.size();
    for (int i = 0; i < lenth; i ++) printf("%c",a[i] + a[(i + 1) % lenth]);
    
    return 0;
}