include <bits/stdc++.h>

using namespace std;

int main () {

int f;

string s, s1;

cin >> s;

cin >> s1;

f = max (s.size (), s1.size ());

for (int i = 0; i < f; i++) {

if (i < s.size ()) {

cout << s[i];

}

if (i < s1.size ()) {

cout << s1[i];

}

}

}