How to efficiently generate ordered list from couple of lines?

Let's say:

list item 1
list item 2
list item 3

into:

  
list item 1
  
list item 2
  
list item 3

Notes:

I could deduct the select_lines from documentation, the problem was:

• on Win (Win 8) Ctrl+Alt+arrow was used for desktop rotation (? :/)
• on Mac (OS X 10.7.5) Ctrl+Shift+arrow was used by Mission Control to animate desktop, despite that the Shortcuts setting shows only Ctrl+Up/Down without Shift. After un-checking the option it works as supposed to.