# https://www.hackerrank.com/challenges/ruby-case
def identify_class(obj)
  case obj
  when Hacker
    puts "It's a Hacker!"
  when Submission
    puts "It's a Submission!"
  when TestCase
    puts "It's a TestCase!"
  when Contest
    puts "It's a Contest!"
  else
    puts "It's an unknown model"
  end
end