hwa = list(map(int, input().split(' ')))
hwb = list(map(int, input().split(' ')))
hwc = list(map(int, input().split(' ')))

def key(hw):
    return hw[0] * 1000 + (100 - hw[1])

cand = [
    ['A', hwa],
    ['B', hwb],
    ['C', hwc]]

result = sorted(cand, key=lambda x: key(x[1]), reverse=True)

for i in result:
    print(i[0])