题解

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