#include<bits/stdc++.h>
using namespace std;

int main(void){
  string s1, s2;
  cin >> s1 >> s2;
  for(int i=0;i<s1.size();++i){
    cout << s1[i];
    if(s2.size() > i) cout << s2[i];
  }
  cout << endl;
}