class Main
  Brother = Struct.new(:i, :h, :w)

  def start
    brothers = main
    brothers.sort_by! { |x| x.w }
    brothers.sort_by!.with_index { |x, i| x.h }
    brothers.reverse!
    echo brothers.map { |x| x.i }.join("\n")

    self.class.send(:remove_const, :Brother)
    return nil
  end 

  private

  def main
    a = []
    for i in 0...3
      h, w = input.split
      brother = Brother.new(("A".ord + i).chr, h, w)
      a += [brother]
    end
    resturn a
  end

  def echo(*x)
    print(*x)
    puts
  end

  def input = gets.chomp
end

Main.new.start