#include<bits/stdc++.h>
using namespace std;
int main(){
	string a,b;
	char s[99];
	int j,i,d=0;
	bool l;
	getline(cin,a); 
	getline(cin,b);
	a+=b;
	for(i=0;i<a.size();i++){
		l=0;
		for(j=0;j<d;j++){
			if(s[j]==a[i]){
				l=1;
				break;
			}
		}
		if(l==0){
			cout<<a[i];
			s[d]=a[i];
			d++;
		}
	} 
return 0;}

/**************************************************************
	Problem: 1105
	User: fzy001
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/