a = []
3.times do |i|
  a << [i] + gets.split.map(&:to_i)
end
a.sort_by!{|x| [-x[1], x[2]]}
a.each do |i|
  puts (
  case i[0]
  when 0
    'A'
  when 1
    'B'
  when 2
    'C'
  end
  )
end