txt = 'ABC'

HW = [[[j for j in input().strip().split(' ')], i] for i in range(3)]
for i in range(len(HW)):
  HW[i][0] = int(HW[i][0][0] + str(101 - int(HW[i][0][1])))
HW = sorted(HW, reverse=True)
for i in HW:
  print(txt[i[1]])