text: from django.contrib import admin
  from . import models
  
  
  @admin.register(models.Card)
  class CardAdmin(admin.ModelAdmin):
      list_display = ('id', 'ejudge_short_name', 'name', 'country')
  
  
  @admin.register(models.Resource)
  class ResourceAdmin(admin.ModelAdmin):
      list_display = ('id', 'name', 'color', 'gender')
  
  
  @admin.register(models.VirtualContest)
  class VirtualContestAdmin(admin.ModelAdmin):
      list_display = ('id', 'name', 'login_prefix')