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#include<stdio.h>
#include<stdlib.h>
#include<string.h> 
int main(void)
{
	char a[50],b[50],res[50];
	gets(a);
	gets(b);
	int c=1; 
	int l1,l2,i,j;
	l1=strlen(a); 
	l2=strlen(b);
        int count=0;
	 int k=0; 
	for(i=l1-1;i>=0;i--)
	{
		for(j=0;j<l2;j++)
		{
			if(a[i]==b[j])
			{

					
				for(k=0;k<count;k++)
				{	if(a[i]==res[k]) c=0;
				}					
				if(c!=0)	 res[count++]=a[i];

			} 
		}
	}
	puts(res);
	return 0;
}