#include<iostream>
#include<string>
using namespace std;
int main(){
	string a,b,c;
	cin>>a>>b;
	for(int i=0;;i++){
		if(a.size()==i)break;
		c+=a[i];
		if(b.size()==i)break;
		c+=b[i];
	}
	cout<<c<<endl;
	return 0;
}