#include <cstdio>
using namespace std;
int s[21],n,k;
void back(int l)
{
    int i;
    if (l==k)
    {
        for (i=1; i<=k; i++) printf("%d ",s[i]);
        printf("\n");
    }
    else
    {
        for (i=s[l]+1;i<=n;i++)
        {
            s[l+1]=i;
            back(l+1);
        }
    }
}
int main()
{
    freopen("combinari.in","r",stdin);
    freopen("combinari.out","w",stdout);
    back(0);
    return 0;
}