tj

#include<bits/stdc++.h>
using namespace std;
string s1,s2,s3;
int main(){
	cin>>s1>>s2;
	if(s1>s2) s3=s1+s2;
	else s3=s2+s1;
	
	int len = s3.length();
	for(int i=1;i<=len-1;i+=2)	cout<<s3[i];
	return 0;
}