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#include<stdio.h>
#include<string.h>
void main()
{
	int l1,l2,i,a1,a2,j;
	char s1[100],s2[100],c[100],p[100];
	scanf("%s",s1);
	scanf("%s",s2);
	l1=strlen(s1);
	l2=strlen(s2);
	if(l1>l2)
	{
		a1=l1;
		a2=l2;
	}
	else
	{
		a1=l2;
		a2=l1;
		strcpy(c,s1);
		strcpy(s1,s2);
		strcpy(s2,c);
	}
	for(i=0;i<a1;i++)
		for(j=0;j<a2;j++)
			if(s1[i]==s2[j])
				printf("%c",s1[i]);
}