stacked markup with parenthesis

[lasconic]

Hi all !
I'm looking for a way to display a text on several lines with parenthesis
around the line (no bracket, round parenthesis). I tried \columns and
\center-align. That's ok to stack texts but how can I put parenthesis around
? (like \bracket does for squared bracket).
Thks a lot !

Example : 

 /    \
|  A  |
|  B  |
 \    /
-- 
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