import sys current_users = ['Niuniu', 'Niumei', 'GURR', 'LOLO'] new_users = ['GurR', 'Niu Ke Le', 'LoLo', 'Tuo Rui Chi'] processed_current_users = [u.lower() for u in current_users] processed_new_users = [u.lower() for u in new_users] for user in new_users: if(user.lower() in processed_current_users...