import strutils, sequtils, algorithm

const
  n = 3
var
  h, w = newSeq[int](n)
  arr = newSeq[string]()

for i in 0 ..< n:
  (h[i], w[i]) = stdin.readLine.split.map parseInt
  arr.add $h[i] & $(200 - w[i]) & (i + 'A'.ord).chr

for v in arr.sorted(cmp, Descending):
  echo v[^1]