tj

#include<bits/stdc++.h>
using namespace std;
int main()
{
string x,y,sum;
cin>>x>>y;
if(x>y) sum=x+y;
else sum=y+x;
for(int i=0;i<sum.size();i++){
if(i%2==1) cout<<sum[i];
}
return 0;
}