Not alot. A lot.
Duolingo team. Please correct this. One of the accepted answers to Danke sehr is "Thanks alot." When I type in "Thanks a lot," the system takes away one heart. I want that heart back.
The same thing happened to me, it said "Thanks alot" was acceptable but "Thanks a lot" (my answer) was marked wrong. I couldn't find "alot" in any dictionary so sent a "feedback" note complaining about this. ps, just read tbroadway's reference and duolingo's "alot" is definitely wrong. Probably the programmer was tired and got them reversed.