#define N 20
char a[N],b[N];
int i,check[256]
int main(void)
{
scnaf("%s%s",a,b);
for(i=0;i<256;++i) *(check+i)=0;
for (i=0;a[i];++i)
   check[a[i]]=1;
for (i=0;b[i];++i)
if (*(check+(*(b+i)))) 
printf("%d",*(b+i));
return 0;
}