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#include<stdio.h>
#include<string.h>
int main()
{
char a[100],b[100],l[100],s[100];
scanf("%s %s",a,b);
if(strlen(a)>strlen(b))
	{
	strcpy(s,b);
	strcpy(l,a);
	
	}
else
	{
	strcpy(s,a);
	strcpy(l,b);
	}
int i,j;
for(i=0;s[i]!='\0';i++)
	for(j=0;l[j]!='\0';j++)
		{
	
		if(l[j]!='\0')
			{if(s[i]==l[j])
				{
				putchar(s[i]);
				l[j]='-';
				break;
				}
			}
			
		}
return 0;
}