#include <stdio.h>
#include <string.h>
#define size 30

char s1[size], s2[size];

void Search(char *a, char *b, int l)
{
	int i;
	if (!l) return;
	for (i = 0; i < l; i++)
		if (b[i] == a[0])
			break;
	Search(a + 1, b, i);
	Search(a + i + 1, b + i + 1, l - i - 1);
	printf("%c", a[0]);
}

int main()
{
	while (EOF != scanf("%s %s", s1, s2))
		Search(s1, s2, strlen(s1)),printf("\n");
	return 0;
}