#include <unistd.h>

int		check_doubles(char *str, char c, int pos)
{
	int i;

	i = 0;
	while (i < pos)
	{
		if (str[i] == c)
			return (0);
		i++;
	}
	return (1);
}
void	inter(char *s1, char *s2)
{
	int	i;
	int	j;

	i = 0;
	while (s1[i])
	{
		j = 0;
		while (s2[j])
		{
			if (s1[i] == s2[j])
			{
				if (check_doubles(s1, s2[i], i) == 1)
				{
					write(1, &s1[i], 1);
					break;
				}
			}
			j++;
		}
		i++;
	}
}
int		main(int ac, char **av)
{

	if (ac == 3)
		inter(av[1], av[2]);
	write(1, "\n", 1);
	return (0);
}