How show multiple cursors in the start of all lines?

Question

Emacs 26.3

Suppose I has the next text:

ACTION
ADVENTURE
COMEDY
CRIME
DRAMA
FANTASY
HISTORICAL
HISTORICAL
HORROR
MAGICAL
MYSTERY
PARANOID
PHILOSOPHICAL
POLITICAL
ROMANCE
SAGA
SATIRE
SCIENCE
SOCIAL
SPECULATIVE
THRILLER
URBAN
WESTERN

And I want by Multiple cursors https://github.com/magnars/multiple-cursors.el

add mulitple cursors in the start of all lines. I don't know count of all lines.

The result must be like this:

Answer 1

The repository README.md -- https://github.com/magnars/multiple-cursors.el -- contains a basic usage introduction that states in relevant part:

• "When you have an active region that spans multiple lines, the following will add a cursor to each line:"

  (global-set-key (kbd "C-S-c C-S-c") 'mc/edit-lines)

• Mark many occurrences

  mc/edit-lines:  "Adds one cursor to each line in the current region."

  mc/edit-beginnings-of-lines:  "Adds a cursor at the start of each line in the current region."

  mc/edit-ends-of-lines:  "Adds a cursor at the end of each line in the current region."