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#include<stdio.h>
#include<string.h>
void main()
{
	char s1[100],s2[100],x[2],s[100];
	int i,l1,l2,sml,j,k;
	scanf("%s %s",s1,s2);
	l1=strlen(s1);
	l2=strlen(s2);
	
	if(l1<l2)
	{
		sml=l1;
		
	}
	else
	{
		sml=l2;
		
	}

	for(i=0;i<sml;i++)
	{
		for(j=0;j<sml;j++)
		{
	
			if(s2[i]==s1[j])
			{	
				x[0]=s2[i];
				for(k=0;k<sml;k++)
				{
					if(x[0]==s[k])
						return;
					else
					{
						s[i]=x[0];
						printf("%c",s[i]);
						return;
					}	
				}
			}
		}
	}
	
}