What are the hosts of competitions whose theme is not "Aliens"?
SELECT Hosts FROM farm_competition WHERE Theme !=  'Aliens'
SELECT Hosts FROM farm_competition WHERE Theme !=  'Aliens'
[{'Hosts': 'Miley Cyrus Jared Leto and Karen Mok'}, {'Hosts': 'Leehom Wang and Kelly Rowland'}, {'Hosts': 'Alicia Keys'}, {'Hosts': 'Vanness Wu and Michelle Branch'}, {'Hosts': 'Shaggy and Coco Lee'}]