{$H+}
const
  s = 'asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3asdfvkh4vk347vhjvkh7j3';
  
begin
  if length(s)<>1804 then
    halt(1);
  writeln('ok');
end.