#include <fstream>
#define NMAX 20

using namespace std;

ifstream f("submultimi.in");
ofstream g("submultimi.out");

int n, v[NMAX], level = 1, fr[NMAX];

void afisare()
{
    for (int i = 1; i <= level; ++ i)
        g << v[i] << " ";
    g << '\n';
}

bool ok()
{
    for (int i = 1; i <= n; ++ i)
        fr[i] = 0;

    for (int i = 1; i <= level; ++ i)
    {
        fr[v[i]] ++;
        if (fr[v[i]] > 1)
            return 0;
    }
    return 1;
}

void backtracking()
{
    while (level)
    {
        bool check = 0;

        while (!check && v[level] < n)
        {
            v[level] ++;
            check = ok();
        }

        if (!check)
            level --;
        else
            if (check)
        {
            afisare();
            v[++ level] = v[level - 1];
        }
    }
}

int main()
{
    f >> n;
    backtracking();
    return 0;
}