def calc(xs)
  ys = xs.sort {|a, b| b[0] <=> a[0] || a[1] <=> b[1] }
  ys.each {|y| puts (y[2] + ?A.ord).chr }
end

xs = (0..2).map {|i| gets.split.map(&:to_i) + [i] }
calc(xs)