a = list(map(int, input().split())) + ['A']
b = list(map(int, input().split())) + ['B']
c = list(map(int, input().split())) + ['C']

l = [a] + [b] + [c]
l = sorted(l, key = lambda x : (-x[0], x[1]))

for i in l:
    print(i[2])