#include<bits/stdc++.h>
using namespace std;
int main(){
    string s,s1,s2,s3;
    getline(cin,s1);
    getline(cin,s2);
    s3=s1+s2;
    for(int i=0;i<s3.size();i++){
        if(s.find(s3[i])==-1) s=s+s3[i];
    }
    cout<<s;
    return 0;
}
/**************************************************************
	Problem: 1105
	User: wenda
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/