Program subsir;
var fi,fo:text;
    a,l:array[1..100000] of longint;
    i,j,max,poz,n:longint;

begin
    assign(fi,'scmax.in'); reset(fi); readln(fi,n);
    assign(fo,'scmax.out'); rewrite(fo);
    for i:=1 to n do read(fi,a[i]);
    l[n]:=1;
    max:=0;
    for i:=n-1 downto 1 do begin
                           max:=0;
                           for j:=i+1 to n do
                                               if (a[i]<a[j]) and (max<l[j]) then max:=l[j];
                           l[i]:=max+1;
                           end;
    for i:=1 to n do if l[i]>max then begin max:=l[i]; poz:=i; end;
    writeln(fo,max) ;
    write(fo,a[poz],' '); i:=poz;
    while i<=n do begin    j:=i+1;
                  while   (j<=n) and (l[j]=max-1) do  if (a[i]<a[j]) then begin
                                                                            write(fo,a[j],' ');
                                                                            max:=max-1;
                                                                            j:=j+1;
                                                                            end
                                                                       else j:=j+1;
                  poz:=i;
                  i:=i+1;
                  end;
    close(fo); close(fi);
end.