#include<bits/stdc++.h>
using namespace std;
string s,s2,s1,s3; 
int c;   
int main(){
    getline(cin,s1);
    getline(cin,s2);
    s3=s1+s2;
    for(int i=0;i<s3.size();i++){
    	if(s.find(s3[i])==-1) s+=s3[i];
    }
    cout<<s;
    
	return 0;
}

/**************************************************************
	Problem: 1105
	User: zhuanghaoxiang
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2076 kb
****************************************************************/