'It would have been terrible if we had lost. We conceded stupid goals and didn't act well in the end. We have to learn from these mistakes,' said Rost.
The match completed the first round in which promoted Mainz 05 and Hanover 96 were the only top flight casualties. Cup holders Werder Bremen won 5-0 at second division Union Berlin on Sunday while mighty Bayern Munich prevailed 3-1 at sixth-division club Neckarelz.
The second round is drawn Saturday and will be played Sep 22. The final is set for May 15, 2010, in Berlin.