function S = indeksKolona(A, n)
    A = [1 2 3 4; 5 6 7 8; 9 10 11 12];
    n = 7;
    brKolona = size(A,2);
    brRedova = size(A,1);
    S = [];
    for i = 1:brKolona
       avgg = 0
       for j = 1:brRedova
           avgg = avgg + A(j,i);
       end
       avgg
       if(avgg / brRedova >= n)
           S = [S i]
    end
end