#include <stdio.h>
#include <stdlib.h>

int target;
int length;
int *set;

void populate_array(int ac, char **av)
{
    int i = 0;
    int j = 2;
    while(j < ac)
    {
        set[i] = atoi(av[j]);
        i++;
        j++;
    }
}

void print_set(int *used)
{
    int i = 0;
    int is_first = 1;
    while(i < length)
    {
        if (used[i] == 1)
        {
            if (is_first)
            {
                fprintf(stdout, "%i", set[i]);
                is_first = 0;
            }
            else
                fprintf(stdout, " %i", set[i]);
        }
        i++;
    }
    printf("\n");
}

void powerset(int index, int current_sum, int *used)
{
    if (index == length)
    {
        if (current_sum == target)
            print_set(used);
        return ;
    }

    powerset(index + 1, current_sum, used);
    used[index] = 1;
    powerset(index + 1, current_sum + set[index], used);
    used[index] = 0;
}

int main(int ac, char **av)
{
    if (ac < 2)
        return (1);
    
    length = ac -2;
    target = atoi(av[1]);
    set = (int *) malloc (sizeof(int) * length);
    int *used = (int *) calloc (length, sizeof(int));
    populate_array(ac, av);
    powerset(0, 0, used);
    free(set);
    free(used);
    return (0);
    
}