#include<bits/stdc++.h>
using namespace std;
int main()
{
    string word1,word2;
    cin>>word1>>word2;
    string result;
    if(word1.length()>=word2.length()){
        result=word 1+word2;
        string remaining;
        for(char c:word2){
            if(result.find(c)==string::npos){
                remaining +=c
            }
        }
        result +=remaining;
    }else{
        result=word2+word1;
        string remaining;
        for(char c:word1){
            if(result.find(c)==string::npos){
                remining+=c;
            }
        }
        result+=remaining;
    }
    cout<<result<<endl;
    return 0;
}