Drag and drop until the right answer is achieved?

Hi,

I have a drag and drop slide where I need to allow the user to keep trying to get the right answer until they do (ie: when the click on submit it will say they are all right or not and allow another attempt). At the moment, when the interaction is complete and the user clicks Submit, they get a right or wrong answer pop up but no option to try again. Can anyone tell me how to set this up please.

thanks