#include <iostream>
using namespace std;
int main()
{
    string a;
    cin >> a;
    char b;
    cin >> b;
    for (int i = 0; i < a.length(); i++)
    {
        if (i % 2 == 0)
        {
            a[i] = b;
        }
        cout << a[i];
    }
    return 0;
}