Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Michael J. "Crocodile" Dundee:  I was sorta married once - - nice girl , good cook , biiig chest . Then I went walkabout , and when I came back , she 'd gone .
Sue Charlton: How long were you gone ?
Michael J. "Crocodile" Dundee: Couple of months .
Walter Reilly: Try _ eighteen _ .
Sue Charlton: And she did n't wait ? Humph - strange girl !
Michael J. "Crocodile" Dundee: Yeah !

months