Move the cursor to the position of the first character of the line above

Hi all,
Is there any key stroke that puts the cursor in the column of the first letter of the above line?
Something like - or + but the cursor moves in the line it is.
I want this to write something aligned fast.

Example
<tab><tab><space><space> something interesting
<keystroke to go below s> write something

I didn't find anything.

Regards,
Javier.

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