#include<stdio.h>
#include<string.h>
main()
{
	char a[100],b[100];
	int c[150]={0};
	int i;
	gets(a);
	gets(b);
	strcat(a,b);
    for(i=0;i<strlen(a);i++)
    {
    	int k=a[i];
    	if(c[k]==0)
    	{
    		printf("%c",a[i]);
    		c[k]++;
		}
	}
}
/**************************************************************
	Problem: 1105
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1036 kb
****************************************************************/