How to get tree of folders in CMD?

In Windows CMD, I use tree c: /f to get a tree of all directories resided in C:. But now I only want to tree out the only sub-directory folders (not files). How to I exclude files in tree command?

Leave out the "/F" switch, since it's what causes Files to be included.

From tree /?:

Graphically displays the folder structure of a drive or path.

TREE [drive:][path] [/F] [/A]

   /F   Display the names of the files in each folder.
   /A   Use ASCII instead of extended characters.

to output to txt file use command: (you will find in on drive C, as specified below)

tree /a > "C:\_TREE-Output.txt"