#include <fstream>

using namespace std;
ifstream f("submultimi.in");
ofstream g("submultimi.out");
int n,i,a[100],j,x;
int main()
{
    f >>n;
    for (i=1;i<=n;i++)
    f >>a[i];
    for (i=1;i<(1<<n);i++)
    {
        x=i;
        for (j=1;j<=n;++j)
            if (x%2==1) g<<a[j]<<" ";
        x/=2;
    }
    g<<'\n';
    return 0;
}