#include <bits/stdc++.h> using namespace std; int main(){ string a,b,s1,s2=""; cin>>a>>b; if(a>b) s1=a+b; else s1=b+a; for(int i=0;i<s1.size();i++) if(i%2==1) s2+=s1[i]; cout<<s2<<endl; return 0; }

#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; }